n | a(n) |
---|---|
1 | 1 |
2 | 6 |
3 | 30 |
4 | 150 |
5 | 726 |
6 | 3510 |
7 | 16854 |
8 | 80886 |
9 | 387606 |
10 | 1857078 |
11 | 8894550 |
12 | 42598518 |
13 | 204000918 |
14 | 976929462 |
15 | 4678286550 |
16 | 22403128566 |
17 | 107282481942 |
18 | 513746046774 |
19 | 2460185076054 |
20 | 11781130000758 |
21 | 56416485185430 |
22 | 270162504104886 |
[1,6,30,150,726,3510,16854,80886,387606,1857078, 8894550,42598518,204000918,976929462,4678286550, 22403128566,107282481942,513746046774, 2460185076054,11781130000758,56416485185430, 270162504104886] |