- 注册时间
- 2017-1-14
- 最后登录
- 1970-1-1
- 威望
- 星
- 金币
- 枚
- 贡献
- 分
- 经验
- 点
- 鲜花
- 朵
- 魅力
- 点
- 上传
- 次
- 下载
- 次
- 积分
- 9778
- 在线时间
- 小时
|
楼主 |
发表于 2019-10-24 14:05:03
|
显示全部楼层
本帖最后由 王守恩 于 2019-10-24 15:14 编辑
不同的数字串摆在一起,变化就出来了。
1, 2, 5, 14, 42, 132, 429, 1430, 4862, 16796, 58786, 208012,
742900, 2674440, 9694845, 35357670, 129644790, 477638700,
1767263190, 6564120420, 24466267020, 91482563640, ............
a(n)=2/2×6/3×10/4×14/5×18/6×22/7×26/8×30/9×.....
1, 3, 10, 35, 126, 462, 1716, 6435, 24310, 92378, 352716, 1352078,
5200300, 20058300, 77558760, 300540195, 1166803110, 4537567650,
17672631900, 68923264410, 269128937220, 1052049481860, ..............
a(n)=6/2×10/3×14/4×18/5×22/6×26/7×30/8×.....
1, 3, 8, 20, 48, 112, 256, 576, 1280, 2816, 6144, 13312, 28672, 61440,
131072, 278528, 589824, 1245184, 2621440, 5505024, 11534336, 24117248,
50331648, 104857600, 218103808, 452984832, 939524096, 1946157056, ............
a(n)=1/1×6/2×8/3×10/4×12/5×14/6×16/7×18/8×20/9×.....
1, 4, 12, 32, 80, 192, 448, 1024, 2304, 5120, 11264, 24576, 53248, 114688,
245760, 524288, 1114112, 2359296, 4980736, 10485760, 22020096, 46137344,
96468992, 201326592, 419430400, 872415232, 1811939328, 3758096384,...........
a(n)=1/1×4/1×6/2×8/3×10/4×12/5×14/6×16/7×18/8×20/9×.....
1, 5, 20, 70, 224, 672, 1920, 5280, 14080, 36608, 93184, 232960, 573440, 1392640,
3342336, 7938048, 18677760, 43581440, 100925440, 232128512, 530579456, 1205862400,
2726297600, 6134169600, 13740539904, 30651973632, 68115496960, 150827171840, ..............
a(n)=1/1×10/2×12/3×14/4×16/5×18/6×20/7×22/8×24/9×.....
1,6,32,160,768,3584,16384,73728,327680,1441792,6291456,27262976,
117440512,503316480,2147483648,9126805504,38654705664,163208757248,687194767360,
2886218022912,12094627905536,50577534877696,211106232532992,879609302220800,..................
a(n)=1/1×12/2×16/3×20/4×24/5×28/6×32/7×36/8×40/9×.....
1, 4, 15, 54, 189, 648, 2187, 7290, 24057, 78732, 255879, 826686, 2657205, 8503056,
27103491, 86093442, 272629233, 860934420, 2711943423, 8523250758, 26732013741,
83682825624, 261508830075, 815907549834, 2541865828329, 7908027021468, ...........
a(n)=1/1×12/3×15/4×18/5×21/6×24/7×27/8×30/9×.....
1, 5, 24, 112, 512, 2304, 10240, 45056, 196608, 851968, 3670016, 15728640,
67108864,285212672, 1207959552, 5100273664, 21474836480, 90194313216,
377957122048, 1580547964928, 6597069766656, 27487790694400,..................
a(n)=1/1×20/4×24/5×28/6×32/7×36/8×40/9×.....
1, 6, 35, 200, 1125, 6250, 34375, 187500, 1015625, 5468750, 29296875, 156250000,
830078125, 4394531250, 23193359375, 122070312500, 640869140625, 3356933593750,
17547607421875, 91552734375000, 476837158203125, 2479553222656250, ..................
a(n)=1/1×30/5×35/6×40/7×45/8×50/9×..... |
|