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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 72 |
| 4 | 8536 |
| 5 | 2231690 |
| 6 | 1354321470 |
| 7 | 2028744947006 |
| 8 | 7685048253383394 |
| 9 | 74968472049231105434 |
| 10 | 1906199245553492643004970 |
[0,0,72,8536,2231690,1354321470,2028744947006, 7685048253383394,74968472049231105434, 1906199245553492643004970] |