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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 25 |
| 4 | 387 |
| 5 | 9481 |
| 6 | 336723 |
| 7 | 16340185 |
| 8 | 1038177507 |
| 9 | 83616187561 |
| 10 | 8323660051443 |
| 11 | 1003415542660345 |
| 12 | 144043181112445827 |
| 13 | 24279259683302736841 |
| 14 | 4747993384270354742163 |
| 15 | 1066206704980940216628505 |
| 16 | 272480888391150986151565347 |
[1,1,3,25,387,9481,336723,16340185,1038177507, 83616187561,8323660051443,1003415542660345, 144043181112445827,24279259683302736841, 4747993384270354742163,1066206704980940216628505, 272480888391150986151565347] |