n | a(n) |
---|---|
2 | 2 |
3 | 4 |
4 | 22 |
5 | 154 |
6 | 924 |
7 | 5744 |
8 | 37530 |
9 | 241091 |
10 | 1545066 |
11 | 10150409 |
12 | 68167608 |
13 | 463298678 |
14 | 3178429166 |
15 | 21994032666 |
16 | 153340266738 |
[2,4,22,154,924,5744,37530,241091,1545066, 10150409,68167608,463298678,3178429166, 21994032666,153340266738] |