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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 72 |
| 3 | 37584 |
| 4 | 53529984 |
| 5 | 152458744320 |
| 6 | 766958183193600 |
| 7 | 6236531290739312640 |
| 8 | 76788695692068062330880 |
| 9 | 1361934174627779827740180480 |
| 10 | 33454092372947487842682293452800 |
| 11 | 1102556254139040688616563751190528000 |
[1,0,72,37584,53529984,152458744320, 766958183193600,6236531290739312640, 76788695692068062330880, 1361934174627779827740180480, 33454092372947487842682293452800, 1102556254139040688616563751190528000] |