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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 120 |
| 2 | 113400 |
| 3 | 168168000 |
| 4 | 305540235000 |
| 5 | 623360743125120 |
| 6 | 1370874167589326400 |
| 7 | 3177459078523411968000 |
| 8 | 7656714453153197981835000 |
| 9 | 19010638202652030712978200000 |
| 10 | 48334775757901219912115629238400 |
| 11 | 125285878026462826569986857692288000 |
[1,120,113400,168168000,305540235000, 623360743125120,1370874167589326400, 3177459078523411968000,7656714453153197981835000, 19010638202652030712978200000, 48334775757901219912115629238400, 125285878026462826569986857692288000] |