n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 2 |
5 | 2 |
6 | 27 |
7 | 214 |
8 | 1695 |
9 | 15482 |
10 | 159019 |
11 | 1775664 |
12 | 21542628 |
13 | 282722448 |
14 | 3989526469 |
15 | 60239477384 |
16 | 969280731152 |
[0,0,0,2,2,27,214,1695,15482,159019,1775664, 21542628,282722448,3989526469,60239477384, 969280731152] |