n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 2 |
4 | 4 |
5 | 8 |
6 | 24 |
7 | 280 |
8 | 16777496 |
9 | 1942668892225729070919461906823518906642406839052139521251812409738904285205225275672 |
[0,0,1,2,4,8,24,280,16777496, 19426688922257290709194619068235189066424068390521\ 39521251812409738904285205225275672] |