n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 1 |
4 | 1 |
5 | 1 |
6 | 2 |
7 | 5 |
8 | 15 |
9 | 52 |
10 | 204 |
11 | 902 |
12 | 4532 |
13 | 26196 |
14 | 175320 |
15 | 1351296 |
16 | 11819348 |
17 | 115309534 |
18 | 1236465988 |
19 | 14419850138 |
20 | 181652022376 |
21 | 2462053028798 |
22 | 35834756184146 |
23 | 559816444117400 |
24 | 9389648056139010 |
25 | 169166236946379128 |
26 | 3273760080403458226 |
27 | 67994123544008546820 |
[1,1,1,1,1,1,2,5,15,52,204,902,4532,26196,175320, 1351296,11819348,115309534,1236465988,14419850138, 181652022376,2462053028798,35834756184146, 559816444117400,9389648056139010, 169166236946379128,3273760080403458226, 67994123544008546820] |