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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 40 |
| 2 | 1560 |
| 3 | 60840 |
| 4 | 2371980 |
| 5 | 92476800 |
| 6 | 3605409600 |
| 7 | 140564736000 |
| 8 | 5480222014020 |
| 9 | 213658376756760 |
| 10 | 8329936604744040 |
| 11 | 324760699264187160 |
| 12 | 12661502336823753660 |
| 13 | 493636212105145265520 |
| 14 | 19245481572342746507280 |
[1,40,1560,60840,2371980,92476800,3605409600, 140564736000,5480222014020,213658376756760, 8329936604744040,324760699264187160, 12661502336823753660,493636212105145265520, 19245481572342746507280] |