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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 120 |
| 8 | 4293 |
| 9 | 88234 |
| 10 | 1310354 |
| 11 | 15724248 |
| 12 | 162512286 |
| 13 | 1505621508 |
| 14 | 12843262863 |
| 15 | 102776998928 |
| 16 | 782115518299 |
| 17 | 5717291972382 |
| 18 | 40457344748072 |
| 19 | 278794377854832 |
| 20 | 1879708669896492 |
| 21 | 12446388300682056 |
| 22 | 81180715002105741 |
[1,120,4293,88234,1310354,15724248,162512286, 1505621508,12843262863,102776998928,782115518299, 5717291972382,40457344748072,278794377854832, 1879708669896492,12446388300682056, 81180715002105741] |