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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 39 |
| 3 | 1125 |
| 4 | 56505 |
| 5 | 4354923 |
| 6 | 476265591 |
| 7 | 70056231213 |
| 8 | 13329387478113 |
| 9 | 3184105899176739 |
| 10 | 932720103991595919 |
| 11 | 328710383679927689157 |
| 12 | 137188135970104212440721 |
| 13 | 66909975066823379752742835 |
| 14 | 37706189062081696231083478647 |
| 15 | 24312515006613477431766856702797 |
| 16 | 17784145956730483348850500758855969 |
| 17 | 14647274671009402833580157237962722147 |
| 18 | 13492886769176913829412675003231182928079 |
[1,3,39,1125,56505,4354923,476265591,70056231213, 13329387478113,3184105899176739, 932720103991595919,328710383679927689157, 137188135970104212440721, 66909975066823379752742835, 37706189062081696231083478647, 24312515006613477431766856702797, 17784145956730483348850500758855969, 14647274671009402833580157237962722147, 13492886769176913829412675003231182928079] |