| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 76 |
| 7 | 6912 |
| 8 | 848932 |
| 9 | 133948836 |
| 10 | 26615510712 |
| 11 | 6549149852112 |
| 12 | 1966499966796816 |
| 13 | 711040444591249476 |
| 14 | 305907023641901084832 |
| 15 | 154921887640109512226304 |
| 16 | 91469751377953081098144816 |
| 17 | 62419855497729620428436222688 |
| 18 | 48849705066296300911892229634944 |
[1,76,6912,848932,133948836,26615510712, 6549149852112,1966499966796816,711040444591249476, 305907023641901084832,154921887640109512226304, 91469751377953081098144816, 62419855497729620428436222688, 48849705066296300911892229634944] |