n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 5 |
4 | 15 |
5 | 50 |
6 | 182 |
7 | 707 |
8 | 2903 |
9 | 12479 |
10 | 55844 |
11 | 258860 |
12 | 1238588 |
13 | 6099054 |
14 | 30836886 |
15 | 159770751 |
16 | 846927495 |
17 | 4586883023 |
18 | 25351486346 |
19 | 142843162421 |
20 | 819783142271 |
21 | 4788268962584 |
22 | 28444114318056 |
23 | 171737405798836 |
24 | 1053285775758916 |
25 | 6558551535958516 |
26 | 41441942236323008 |
[1,1,2,5,15,50,182,707,2903,12479,55844,258860, 1238588,6099054,30836886,159770751,846927495, 4586883023,25351486346,142843162421,819783142271, 4788268962584,28444114318056,171737405798836, 1053285775758916,6558551535958516, 41441942236323008] |