n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 0 |
6 | 0 |
7 | 0 |
8 | 0 |
9 | 40320 |
10 | 3628800 |
11 | 219542400 |
12 | 11496038400 |
13 | 570031862400 |
14 | 27908676956160 |
15 | 1379187810000000 |
16 | 69648048665395200 |
17 | 3619848890071814400 |
18 | 194428045753727385600 |
19 | 10817313676715756770560 |
20 | 624148118196535296000000 |
21 | 37365232440634029661766400 |
[1,0,0,0,0,0,0,0,0,40320,3628800,219542400, 11496038400,570031862400,27908676956160, 1379187810000000,69648048665395200, 3619848890071814400,194428045753727385600, 10817313676715756770560,624148118196535296000000, 37365232440634029661766400] |