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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 24 |
| 3 | 6720 |
| 4 | 5644800 |
| 5 | 16388749440 |
| 6 | 172145618789760 |
| 7 | 6709378999665162240 |
| 8 | 988932080423985278515200 |
| 9 | 559938250258499272920457420800 |
| 10 | 1233183626500802426354472388092518400 |
| 11 | 10663689261713618730124837637890877517004800 |
[0,24,6720,5644800,16388749440,172145618789760, 6709378999665162240,988932080423985278515200, 559938250258499272920457420800, 1233183626500802426354472388092518400, 10663689261713618730124837637890877517004800] |