n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 2 |
3 | 6 |
4 | 48 |
5 | 360 |
6 | 3600 |
7 | 40320 |
8 | 524160 |
9 | 7620480 |
10 | 123379200 |
11 | 2195424000 |
12 | 42631142400 |
13 | 896690995200 |
14 | 20312541849600 |
15 | 492993236736000 |
16 | 12762901831680000 |
17 | 351063491530752000 |
18 | 10224590808047616000 |
[1,0,2,6,48,360,3600,40320,524160,7620480, 123379200,2195424000,42631142400,896690995200, 20312541849600,492993236736000,12762901831680000, 351063491530752000,10224590808047616000] |