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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 25 |
| 4 | 217 |
| 5 | 2541 |
| 6 | 34531 |
| 7 | 550453 |
| 8 | 9957585 |
| 9 | 202137337 |
| 10 | 4543312771 |
| 11 | 112004037201 |
| 12 | 3003936136873 |
| 13 | 87057179039845 |
| 14 | 2710682505789987 |
| 15 | 90230919126896941 |
| 16 | 3197152300287286561 |
| 17 | 120131212083966304113 |
[1,1,3,25,217,2541,34531,550453,9957585,202137337, 4543312771,112004037201,3003936136873, 87057179039845,2710682505789987,90230919126896941, 3197152300287286561,120131212083966304113] |