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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 40 |
| 2 | 1560 |
| 3 | 60060 |
| 4 | 2311920 |
| 5 | 88979280 |
| 6 | 3424561140 |
| 7 | 131801403240 |
| 8 | 5072652999960 |
| 9 | 195231667516860 |
| 10 | 7513899339838320 |
| 11 | 289188142406526480 |
| 12 | 11130010920731869140 |
| 13 | 428361764988438838440 |
| 14 | 16486399071025250766360 |
[1,40,1560,60060,2311920,88979280,3424561140, 131801403240,5072652999960,195231667516860, 7513899339838320,289188142406526480, 11130010920731869140,428361764988438838440, 16486399071025250766360] |