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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 4 |
| 3 | 24 |
| 4 | 1744 |
| 5 | 88480 |
| 6 | 20785984 |
| 7 | 4774925568 |
| 8 | 3557583518976 |
| 9 | 2784648830636544 |
| 10 | 7054995406469377024 |
| 11 | 16660711592693252288512 |
[0,4,24,1744,88480,20785984,4774925568, 3557583518976,2784648830636544, 7054995406469377024,16660711592693252288512] |