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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 16320 |
| 2 | 534790080 |
| 3 | 234174178560 |
| 4 | 17524001357760 |
| 5 | 498046875016320 |
| 6 | 7673653657232640 |
| 7 | 77480203842286080 |
| 8 | 574226476491096000 |
| 9 | 3360143509958850240 |
| 10 | 16320498047409790080 |
| 11 | 68172690124863440640 |
| 12 | 251450283274373326080 |
[1,16320,534790080,234174178560,17524001357760, 498046875016320,7673653657232640, 77480203842286080,574226476491096000, 3360143509958850240,16320498047409790080, 68172690124863440640,251450283274373326080] |