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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 35 |
| 5 | 394 |
| 6 | 8804 |
| 7 | 397482 |
| 8 | 35759656 |
| 9 | 6485002635 |
| 10 | 2338622693988 |
| 11 | 1698239604693650 |
| 12 | 2450945990748440102 |
| 13 | 7121092086085582889354 |
| 14 | 41114705331946969977079884 |
| 15 | 477857552284771772990908082576 |
[1,1,2,6,35,394,8804,397482,35759656,6485002635, 2338622693988,1698239604693650, 2450945990748440102,7121092086085582889354, 41114705331946969977079884, 477857552284771772990908082576] |