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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 28565107560 |
| 4 | 272454472598400 |
| 5 | 142575583958069520 |
| 6 | 18434332194257819520 |
| 7 | 1017379423994278214520 |
| 8 | 31340171098354199988480 |
| 9 | 628988614673638882511520 |
| 10 | 9076042310340825810167040 |
| 11 | 100702084869046006909196040 |
| 12 | 901495065442530655732775040 |
[0,0,0,28565107560,272454472598400, 142575583958069520,18434332194257819520, 1017379423994278214520,31340171098354199988480, 628988614673638882511520, 9076042310340825810167040, 100702084869046006909196040, 901495065442530655732775040] |