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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 80 |
| 6 | 7680 |
| 7 | 1146880 |
| 8 | 293601280 |
| 9 | 135291469824 |
| 10 | 115448720916480 |
| 11 | 185773484629032960 |
| 12 | 570696144780389253120 |
| 13 | 3376492035251796327792640 |
| 14 | 38724311853895801724188229632 |
| 15 | 865171534655766566521499937669120 |
[1,80,7680,1146880,293601280,135291469824, 115448720916480,185773484629032960, 570696144780389253120,3376492035251796327792640, 38724311853895801724188229632, 865171534655766566521499937669120] |