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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 35 |
| 8 | 780 |
| 9 | 14190 |
| 10 | 230300 |
| 11 | 3478761 |
| 12 | 50063860 |
| 13 | 696190560 |
| 14 | 9440350920 |
| 15 | 125595622175 |
| 16 | 1646492110120 |
| 17 | 21335200040700 |
| 18 | 273897571557780 |
| 19 | 3489735464257595 |
| 20 | 44186942677323600 |
| 21 | 556608279578340080 |
[1,35,780,14190,230300,3478761,50063860,696190560, 9440350920,125595622175,1646492110120, 21335200040700,273897571557780,3489735464257595, 44186942677323600,556608279578340080] |