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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 32 |
| 3 | 432 |
| 4 | 10752 |
| 5 | 504832 |
| 6 | 35418112 |
| 7 | 3115462656 |
| 8 | 333569720320 |
| 9 | 44698511474688 |
| 10 | 7574890049699840 |
| 11 | 1575934549490139136 |
| 12 | 387157222106970718208 |
| 13 | 110017544405171642040320 |
[1,4,32,432,10752,504832,35418112,3115462656, 333569720320,44698511474688,7574890049699840, 1575934549490139136,387157222106970718208, 110017544405171642040320] |