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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 1 |
| 8 | 81729648000 |
| 9 | 109829050417159537464000 |
| 10 | 262180318469859848392495320519360000 |
| 11 | 1383686991412953935264882502412625112170448000000 |
[0,0,0,0,0,0,1,81729648000, 109829050417159537464000, 262180318469859848392495320519360000, 1383686991412953935264882502412625112170448000000] |