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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 107 |
| 4 | 109720 |
| 5 | 5916402624 |
| 6 | 25690641168448256 |
| 7 | 12501662072725447325457536 |
| 8 | 901886074956174349048867091963183104 |
| 9 | 12343856662712388173832816538241443833756015132672 |
| 10 | 39989244654801819205752864236178211163455535276138236680981184512 |
[0,1,3,107,109720,5916402624,25690641168448256, 12501662072725447325457536, 901886074956174349048867091963183104, 12343856662712388173832816538241443833756015132672\ , 39989244654801819205752864236178211163455535276138\ 236680981184512] |