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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 180 |
| 3 | 181440 |
| 4 | 2961100800 |
| 5 | 775476766310400 |
| 6 | 3251791214634074112000 |
| 7 | 218210695042457748180566016000 |
| 8 | 234298374547168764346587444978647040000 |
| 9 | 4025200069765920285793155323595159699896401920000 |
| 10 | 1106437515026051855463365435310419366987397763763798016000000 |
[1,3,180,181440,2961100800,775476766310400, 3251791214634074112000, 218210695042457748180566016000, 234298374547168764346587444978647040000, 4025200069765920285793155323595159699896401920000, 11064375150260518554633654353104193669873977637637\ 98016000000] |