n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 4 |
5 | 8 |
6 | 38 |
7 | 266 |
8 | 1680 |
9 | 10248 |
10 | 79464 |
11 | 1000104 |
12 | 8399496 |
13 | 103697496 |
14 | 1238886096 |
15 | 17072760600 |
16 | 251355438936 |
17 | 3752124770520 |
18 | 60861072664560 |
19 | 1076909248451064 |
20 | 19217616589357368 |
21 | 369028769473844088 |
[1,1,1,4,8,38,266,1680,10248,79464,1000104, 8399496,103697496,1238886096,17072760600, 251355438936,3752124770520,60861072664560, 1076909248451064,19217616589357368, 369028769473844088] |