n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 2 |
4 | 5 |
5 | 15 |
6 | 60 |
7 | 286 |
8 | 1423 |
9 | 7185 |
10 | 37758 |
11 | 212596 |
12 | 1293577 |
13 | 8415869 |
14 | 57715274 |
15 | 414520958 |
16 | 3125102795 |
17 | 24880061105 |
18 | 209909409566 |
19 | 1871945790360 |
20 | 17503956383037 |
21 | 169851122851049 |
22 | 1694189515772750 |
23 | 17248694322541778 |
24 | 178473482993477591 |
25 | 1873036127628583885 |
[1,1,1,2,5,15,60,286,1423,7185,37758,212596, 1293577,8415869,57715274,414520958,3125102795, 24880061105,209909409566,1871945790360, 17503956383037,169851122851049,1694189515772750, 17248694322541778,178473482993477591, 1873036127628583885] |