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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 60 |
| 3 | 1260 |
| 4 | 40320 |
| 5 | 1814400 |
| 6 | 108864000 |
| 7 | 8382528000 |
| 8 | 804722688000 |
| 9 | 94152554496000 |
| 10 | 13181357629440000 |
| 11 | 2174924008857600000 |
| 12 | 417585409700659200000 |
| 13 | 92286375543845683200000 |
| 14 | 23256166637049112166400000 |
| 15 | 6628007491558996967424000000 |
[1,5,60,1260,40320,1814400,108864000,8382528000, 804722688000,94152554496000,13181357629440000, 2174924008857600000,417585409700659200000, 92286375543845683200000, 23256166637049112166400000, 6628007491558996967424000000] |