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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 30 |
| 2 | 2090 |
| 3 | 165648 |
| 4 | 13873002 |
| 5 | 1198158780 |
| 6 | 105534616880 |
| 7 | 9423350114880 |
| 8 | 849915927124330 |
| 9 | 77248168052615490 |
| 10 | 7063878565972568340 |
| 11 | 649143744147709730400 |
| 12 | 59897782807583055382320 |
| 13 | 5545885349166413944400400 |
| 14 | 514993443497655350848314048 |
| 15 | 47943397954241622806694753648 |
[1,30,2090,165648,13873002,1198158780, 105534616880,9423350114880,849915927124330, 77248168052615490,7063878565972568340, 649143744147709730400,59897782807583055382320, 5545885349166413944400400, 514993443497655350848314048, 47943397954241622806694753648] |