n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 4 |
4 | 19 |
5 | 96 |
6 | 508 |
7 | 2780 |
8 | 15607 |
9 | 89392 |
10 | 520337 |
11 | 3069232 |
12 | 18305876 |
13 | 110214144 |
14 | 668950744 |
15 | 4088824140 |
16 | 25146253311 |
17 | 155491812384 |
18 | 966142729939 |
19 | 6029139839684 |
20 | 37771401328459 |
21 | 237467581184384 |
22 | 1497754198565104 |
[1,0,1,4,19,96,508,2780,15607,89392,520337, 3069232,18305876,110214144,668950744,4088824140, 25146253311,155491812384,966142729939, 6029139839684,37771401328459,237467581184384, 1497754198565104] |