n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 2 |
4 | 18 |
5 | 116 |
6 | 627 |
7 | 6211 |
8 | 59011 |
9 | 449824 |
10 | 5256100 |
11 | 90734544 |
12 | 1163859524 |
13 | 24333174896 |
14 | 578216191424 |
15 | 11292787466976 |
[1,2,2,18,116,627,6211,59011,449824,5256100, 90734544,1163859524,24333174896,578216191424, 11292787466976] |