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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 19 |
| 5 | 1527 |
| 6 | 16001 |
| 7 | 2079863 |
| 8 | 25138879 |
| 9 | 3977502767 |
| 10 | 9094756956909 |
| 11 | 123064080712655 |
| 12 | 323237794212444689 |
| 13 | 63954318104304685581 |
| 14 | 908009997951266138587 |
| 15 | 185964440670918582766943 |
| 16 | 563569187656087282078158821 |
| 17 | 1764211191341056000567768115459 |
[1,1,3,19,1527,16001,2079863,25138879,3977502767, 9094756956909,123064080712655,323237794212444689, 63954318104304685581,908009997951266138587, 185964440670918582766943, 563569187656087282078158821, 1764211191341056000567768115459] |