n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 12 |
5 | 57 |
6 | 366 |
7 | 2340 |
8 | 16252 |
9 | 115940 |
10 | 854981 |
11 | 6444826 |
12 | 49554420 |
13 | 387203390 |
14 | 3068067060 |
15 | 24604111560 |
16 | 199398960212 |
17 | 1631041938108 |
18 | 13451978877748 |
19 | 111765327780200 |
20 | 934774244822704 |
21 | 7865200653146905 |
[1,1,2,12,57,366,2340,16252,115940,854981,6444826, 49554420,387203390,3068067060,24604111560, 199398960212,1631041938108,13451978877748, 111765327780200,934774244822704,7865200653146905] |