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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 24 |
| 3 | 2640 |
| 4 | 3230080 |
| 5 | 48251508480 |
| 6 | 9307700611292160 |
| 7 | 24061983498249428379648 |
| 8 | 855847205541481495117975879680 |
| 9 | 427102683126284520201657800159366676480 |
| 10 | 3035991776725501434069099002640396043332019814400 |
| 11 | 311112533558482034321687955029997989477274014274150137856000 |
[1,2,24,2640,3230080,48251508480,9307700611292160, 24061983498249428379648, 855847205541481495117975879680, 427102683126284520201657800159366676480, 3035991776725501434069099002640396043332019814400, 31111253355848203432168795502999798947727401427415\ 0137856000] |