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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 8 |
| 3 | 528 |
| 4 | 34840 |
| 5 | 2298912 |
| 6 | 151693352 |
| 7 | 10009462320 |
| 8 | 660472819768 |
| 9 | 43581196642368 |
| 10 | 2875698505576520 |
| 11 | 189752520171407952 |
| 12 | 12520790632807348312 |
| 13 | 826182429245113580640 |
| 14 | 54515519539544688973928 |
[0,8,528,34840,2298912,151693352,10009462320, 660472819768,43581196642368,2875698505576520, 189752520171407952,12520790632807348312, 826182429245113580640,54515519539544688973928] |