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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 31 |
| 3 | 399 |
| 4 | 5871 |
| 5 | 93753 |
| 6 | 1577479 |
| 7 | 27556623 |
| 8 | 495001327 |
| 9 | 9085988613 |
| 10 | 169675769781 |
| 11 | 3213444254133 |
| 12 | 61573700137431 |
| 13 | 1191526503165729 |
| 14 | 23252920338835911 |
| 15 | 457112339182896399 |
| 16 | 9043566887755775727 |
| 17 | 179928068420530483389 |
| 18 | 3597714616543167088921 |
[1,3,31,399,5871,93753,1577479,27556623,495001327, 9085988613,169675769781,3213444254133, 61573700137431,1191526503165729,23252920338835911, 457112339182896399,9043566887755775727, 179928068420530483389,3597714616543167088921] |