n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 1 |
6 | 3 |
7 | 31 |
8 | 298 |
9 | 2616 |
10 | 20346 |
11 | 140605 |
12 | 880737 |
13 | 5082279 |
14 | 27402524 |
15 | 139587885 |
16 | 677772953 |
17 | 3158930531 |
18 | 14212444473 |
19 | 62009204208 |
20 | 263350765116 |
21 | 1092085621098 |
22 | 4433596269478 |
[0,0,0,0,1,3,31,298,2616,20346,140605,880737, 5082279,27402524,139587885,677772953,3158930531, 14212444473,62009204208,263350765116, 1092085621098,4433596269478] |