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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 12 |
| 3 | 370 |
| 4 | 21490 |
| 5 | 2012346 |
| 6 | 276603096 |
| 7 | 52410015372 |
| 8 | 13086020092860 |
| 9 | 4162089324641820 |
| 10 | 1642246641208135248 |
| 11 | 786999935144858519448 |
| 12 | 450157417640763926225496 |
| 13 | 302899153448396612425831800 |
| 14 | 236824761815538353605549389600 |
| 15 | 212892105513043495761147435785040 |
[1,1,12,370,21490,2012346,276603096,52410015372, 13086020092860,4162089324641820, 1642246641208135248,786999935144858519448, 450157417640763926225496, 302899153448396612425831800, 236824761815538353605549389600, 212892105513043495761147435785040] |