n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 6 |
4 | 28 |
5 | 235 |
6 | 2466 |
7 | 31864 |
8 | 488328 |
9 | 8901981 |
10 | 183417490 |
11 | 4300791946 |
12 | 111621409956 |
13 | 3214239089659 |
14 | 100662133475372 |
15 | 3440691046061130 |
16 | 126342964714732576 |
17 | 4999000389915029881 |
18 | 210671936366279249610 |
19 | 9474491260037610708598 |
20 | 450638933972015166026220 |
[1,1,1,6,28,235,2466,31864,488328,8901981, 183417490,4300791946,111621409956,3214239089659, 100662133475372,3440691046061130, 126342964714732576,4999000389915029881, 210671936366279249610,9474491260037610708598, 450638933972015166026220] |