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| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 3 |
| 5 | 9 |
| 6 | 36 |
| 7 | 228 |
| 8 | 2196 |
| 9 | 33901 |
| 10 | 862503 |
| 11 | 36346723 |
| 12 | 2564238411 |
| 13 | 304902857694 |
| 14 | 61384367733677 |
| 15 | 21020435566780278 |
| 16 | 12292402317454051941 |
| 17 | 12319906894146608845054 |
| 18 | 21234027294331775378957366 |
[1,3,9,36,228,2196,33901,862503,36346723, 2564238411,304902857694,61384367733677, 21020435566780278,12292402317454051941, 12319906894146608845054, 21234027294331775378957366] |