n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 1 |
4 | 1 |
5 | 4 |
6 | 10 |
7 | 20 |
8 | 125 |
9 | 461 |
10 | 1301 |
11 | 11210 |
12 | 55220 |
13 | 202840 |
14 | 2223859 |
15 | 13690951 |
16 | 61889101 |
17 | 823947856 |
18 | 6087160726 |
19 | 32676403052 |
20 | 511799407517 |
21 | 4411241879141 |
22 | 27418828825961 |
23 | 493869702112622 |
24 | 4864805677935368 |
25 | 34361404413755056 |
26 | 699648473127100771 |
[1,1,1,1,1,4,10,20,125,461,1301,11210,55220, 202840,2223859,13690951,61889101,823947856, 6087160726,32676403052,511799407517,4411241879141, 27418828825961,493869702112622,4864805677935368, 34361404413755056,699648473127100771] |