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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 0 |
| 4 | 3 |
| 5 | 40 |
| 6 | 585 |
| 7 | 15708 |
| 8 | 760277 |
| 9 | 67656960 |
| 10 | 11346344145 |
| 11 | 3648840170580 |
| 12 | 2277220167519825 |
| 13 | 2780207051899228224 |
| 14 | 6675377730807161508041 |
| 15 | 31633731603265107184483860 |
| 16 | 296598264243770222308892404305 |
[0,0,1,0,3,40,585,15708,760277,67656960, 11346344145,3648840170580,2277220167519825, 2780207051899228224,6675377730807161508041, 31633731603265107184483860, 296598264243770222308892404305] |