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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5040 |
| 2 | 681080400 |
| 3 | 182509367040000 |
| 4 | 66475579247327250000 |
| 5 | 28837919555681211870935040 |
| 6 | 14007180988362844601443040716800 |
| 7 | 7363615666157189603982585462030336000 |
| 8 | 4104167472585675600759440022842715359250000 |
| 9 | 2392741010223442438553822446842770682716580000000 |
[1,5040,681080400,182509367040000, 66475579247327250000,28837919555681211870935040, 14007180988362844601443040716800, 7363615666157189603982585462030336000, 4104167472585675600759440022842715359250000, 2392741010223442438553822446842770682716580000000] |