n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 15 |
4 | 150 |
5 | 1250 |
6 | 9375 |
7 | 65625 |
8 | 437500 |
9 | 2812500 |
10 | 17578125 |
11 | 107421875 |
12 | 644531250 |
13 | 3808593750 |
14 | 22216796875 |
15 | 128173828125 |
16 | 732421875000 |
17 | 4150390625000 |
18 | 23345947265625 |
19 | 130462646484375 |
20 | 724792480468750 |
[0,0,1,15,150,1250,9375,65625,437500,2812500, 17578125,107421875,644531250,3808593750, 22216796875,128173828125,732421875000, 4150390625000,23345947265625,130462646484375, 724792480468750] |