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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 12 |
| 3 | 120 |
| 4 | 15120 |
| 5 | 640320 |
| 6 | 143136576 |
| 7 | 14091272832 |
| 8 | 5105629251840 |
| 9 | 906008454739968 |
| 10 | 490783256100396032 |
| 11 | 136461255865204086784 |
| 12 | 104233836908816608661504 |
| 13 | 41544908070600747941806080 |
[1,0,12,120,15120,640320,143136576,14091272832, 5105629251840,906008454739968,490783256100396032, 136461255865204086784,104233836908816608661504, 41544908070600747941806080] |