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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 24 |
| 3 | 1800 |
| 4 | 878080 |
| 5 | 2857680000 |
| 6 | 63117561830400 |
| 7 | 9577928124440387712 |
| 8 | 10077943267571584204800000 |
| 9 | 74054886893191804566576837427200 |
| 10 | 3822038592032831128918160803430400000000 |
| 11 | 1391938996758770867922655936144556115037409280000 |
[1,2,24,1800,878080,2857680000,63117561830400, 9577928124440387712,10077943267571584204800000, 74054886893191804566576837427200, 3822038592032831128918160803430400000000, 1391938996758770867922655936144556115037409280000] |