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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 8 |
| 4 | 108 |
| 5 | 4500 |
| 6 | 460800 |
| 7 | 126547200 |
| 8 | 90150278400 |
| 9 | 168726978201600 |
| 10 | 825645617596800000 |
| 11 | 10582810279847245440000 |
| 12 | 355057327760217947504640000 |
| 13 | 31189165230267027857184030720000 |
| 14 | 7172521863132011354816602281246720000 |
[1,1,8,108,4500,460800,126547200,90150278400, 168726978201600,825645617596800000, 10582810279847245440000, 355057327760217947504640000, 31189165230267027857184030720000, 7172521863132011354816602281246720000] |