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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 720 |
| 2 | 7257600 |
| 3 | 15676416000 |
| 4 | 3476402012160000 |
| 5 | 3320318656512000000 |
| 6 | 4919915372473221120000000 |
| 7 | 4632289550697863577600000000 |
| 8 | 507464726196802564122476544000000000 |
| 9 | 173072180302909506079665684480000000000 |
| 10 | 49554442037561776763544469977956352000000000000 |
[1,720,7257600,15676416000,3476402012160000, 3320318656512000000,4919915372473221120000000, 4632289550697863577600000000, 507464726196802564122476544000000000, 173072180302909506079665684480000000000, 49554442037561776763544469977956352000000000000] |