n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 8 |
4 | 40 |
5 | 224 |
6 | 1368 |
7 | 9008 |
8 | 63488 |
9 | 476160 |
10 | 3781512 |
11 | 31664480 |
12 | 278523280 |
13 | 2565244096 |
14 | 24668577152 |
15 | 247071942208 |
[1,1,2,8,40,224,1368,9008,63488,476160,3781512, 31664480,278523280,2565244096,24668577152, 247071942208] |