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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 87 |
| 3 | 531 |
| 4 | 2281 |
| 5 | 23348 |
| 6 | 191192 |
| 7 | 1247716 |
| 8 | 9450219 |
| 9 | 74086027 |
| 10 | 542295341 |
| 11 | 4014135733 |
| 12 | 30366147431 |
| 13 | 226985241429 |
| 14 | 1690164545942 |
| 15 | 12658565659102 |
| 16 | 94748613114792 |
| 17 | 707806468257951 |
| 18 | 5292426347783239 |
| 19 | 39588593164337549 |
[1,87,531,2281,23348,191192,1247716,9450219, 74086027,542295341,4014135733,30366147431, 226985241429,1690164545942,12658565659102, 94748613114792,707806468257951,5292426347783239, 39588593164337549] |