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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 75 |
| 3 | 3600 |
| 4 | 314721 |
| 5 | 42928704 |
| 6 | 8362250379 |
| 7 | 2196324000000 |
| 8 | 746766466070625 |
| 9 | 318799285706474496 |
| 10 | 166848786507705952491 |
| 11 | 105015062916733187395584 |
| 12 | 78238953853457166762890625 |
| 13 | 68086982534559349084416000000 |
| 14 | 68431651668664224198422729187051 |
[1,4,75,3600,314721,42928704,8362250379, 2196324000000,746766466070625,318799285706474496, 166848786507705952491,105015062916733187395584, 78238953853457166762890625, 68086982534559349084416000000, 68431651668664224198422729187051] |