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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 46080 |
| 4 | 8707262054400 |
| 5 | 9325207163130772193280000 |
| 6 | 282114820702333003219864073866838016000000 |
| 7 | 519832475166470446526522688211309314023066144499302400000000000 |
[0,0,46080,8707262054400, 9325207163130772193280000, 282114820702333003219864073866838016000000, 51983247516647044652652268821130931402306614449930\ 2400000000000] |