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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 13 |
| 4 | 125 |
| 5 | 1761 |
| 6 | 34153 |
| 7 | 833253 |
| 8 | 24627705 |
| 9 | 855798877 |
| 10 | 34223775091 |
| 11 | 1549090700059 |
| 12 | 78325577416281 |
| 13 | 4376902102440375 |
| 14 | 267933660979057571 |
| 15 | 17834397187887850661 |
| 16 | 1282662234529669344753 |
| 17 | 99133711906097886767313 |
| 18 | 8194555387462964814207631 |
[1,3,13,125,1761,34153,833253,24627705,855798877, 34223775091,1549090700059,78325577416281, 4376902102440375,267933660979057571, 17834397187887850661,1282662234529669344753, 99133711906097886767313,8194555387462964814207631] |