n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 1 |
5 | 4 |
6 | 17 |
7 | 129 |
8 | 866 |
9 | 9075 |
10 | 88698 |
11 | 1112175 |
12 | 14313330 |
13 | 220011636 |
14 | 3431683284 |
15 | 62269608609 |
16 | 1163234669730 |
17 | 24101988742305 |
18 | 523745594548440 |
19 | 12344106261015651 |
20 | 303786221723300928 |
[1,1,1,1,4,17,129,866,9075,88698,1112175,14313330, 220011636,3431683284,62269608609,1163234669730, 24101988742305,523745594548440,12344106261015651, 303786221723300928] |