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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 21 |
| 8 | 266 |
| 9 | 2898 |
| 10 | 31899 |
| 11 | 375375 |
| 12 | 4754200 |
| 13 | 64566645 |
| 14 | 936889954 |
| 15 | 14477748285 |
| 16 | 237514188730 |
| 17 | 4124517063940 |
| 18 | 75606129579493 |
| 19 | 1459266319935423 |
| 20 | 29585813267243475 |
| 21 | 628724462015327265 |
| 22 | 13976353234658809071 |
| 23 | 324398325664769299713 |
| 24 | 7848176443746842027187 |
[1,21,266,2898,31899,375375,4754200,64566645, 936889954,14477748285,237514188730,4124517063940, 75606129579493,1459266319935423,29585813267243475, 628724462015327265,13976353234658809071, 324398325664769299713,7848176443746842027187] |