n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 1 |
5 | 3 |
6 | 16 |
7 | 78 |
8 | 397 |
9 | 2037 |
10 | 10820 |
11 | 58349 |
12 | 320824 |
13 | 1790189 |
14 | 10125858 |
15 | 57938771 |
16 | 334941363 |
17 | 1953830203 |
18 | 11489589280 |
19 | 68053757016 |
20 | 405714603234 |
21 | 2433001205088 |
22 | 14668531344984 |
23 | 88869454457853 |
24 | 540834122500464 |
[0,0,0,1,3,16,78,397,2037,10820,58349,320824, 1790189,10125858,57938771,334941363,1953830203, 11489589280,68053757016,405714603234, 2433001205088,14668531344984,88869454457853, 540834122500464] |