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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 24 |
| 5 | 168 |
| 6 | 1834560 |
| 7 | 6516224 |
| 8 | 881280 |
| 9 | 517517500266693633076805172570524811961093324800 |
| 10 | 12291248474277267848395134563637563923813851715476607482451722240 |
| 11 | 9432427640268436606451425375305719340471711381221905226790680395776 |
[1,2,5,24,168,1834560,6516224,881280, 517517500266693633076805172570524811961093324800, 12291248474277267848395134563637563923813851715476\ 607482451722240, 94324276402684366064514253753057193404717113812219\ 05226790680395776] |