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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 186 |
| 3 | 22960 |
| 4 | 6831650 |
| 5 | 4071581010 |
| 6 | 4297593045900 |
| 7 | 7359945086654160 |
| 8 | 19160998099781838300 |
| 9 | 72124861521922576867500 |
| 10 | 377272837054974521764903800 |
| 11 | 2655805439512625993259947280000 |
| 12 | 24502785480337947107875310460499800 |
| 13 | 289788471352423824164622588783247815000 |
[1,5,186,22960,6831650,4071581010,4297593045900, 7359945086654160,19160998099781838300, 72124861521922576867500, 377272837054974521764903800, 2655805439512625993259947280000, 24502785480337947107875310460499800, 289788471352423824164622588783247815000] |