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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 720 |
| 2 | 1413792 |
| 3 | 2940381648 |
| 4 | 6173789662504 |
| 5 | 12981179566917088 |
| 6 | 27297846037161958056 |
| 7 | 57403822541579269311072 |
| 8 | 120712076511505386344017520 |
| 9 | 253839841305922000782983605664 |
| 10 | 533787802709908480895773030991840 |
| 11 | 1122477022599575074944649300433060288 |
[1,720,1413792,2940381648,6173789662504, 12981179566917088,27297846037161958056, 57403822541579269311072, 120712076511505386344017520, 253839841305922000782983605664, 533787802709908480895773030991840, 1122477022599575074944649300433060288] |