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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 9506 |
| 4 | 1077872 |
| 5 | 107299718 |
| 6 | 9825363032 |
| 7 | 858207069508 |
| 8 | 72625487040016 |
| 9 | 6007728913623056 |
| 10 | 488523634696859056 |
| 11 | 39196259623189234184 |
| 12 | 3111246267613100340408 |
| 13 | 244789484044223612860832 |
[0,0,9506,1077872,107299718,9825363032, 858207069508,72625487040016,6007728913623056, 488523634696859056,39196259623189234184, 3111246267613100340408,244789484044223612860832] |