n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 2 |
5 | 36 |
6 | 264 |
7 | 1223 |
8 | 4462 |
9 | 14328 |
10 | 55017 |
11 | 305712 |
12 | 2436601 |
13 | 19006535 |
14 | 123949281 |
15 | 690092171 |
16 | 3461268856 |
17 | 16984062800 |
18 | 90079107517 |
19 | 548487219149 |
20 | 3658610091214 |
21 | 24346275430333 |
22 | 153077920654892 |
[1,1,2,2,36,264,1223,4462,14328,55017,305712, 2436601,19006535,123949281,690092171,3461268856, 16984062800,90079107517,548487219149, 3658610091214,24346275430333,153077920654892] |