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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 496 |
| 3 | 869824 |
| 4 | 21467623936 |
| 5 | 7881126729140224 |
| 6 | 44075357435370071351296 |
| 7 | 3802951448073847111253622882304 |
| 8 | 5104235473390420925196874786915866443776 |
| 9 | 107176786696765659714361271737312271270497663320064 |
[1,4,496,869824,21467623936,7881126729140224, 44075357435370071351296, 3802951448073847111253622882304, 5104235473390420925196874786915866443776, 10717678669676565971436127173731227127049766332006\ 4] |