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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 37 |
| 3 | 257 |
| 4 | 1915 |
| 5 | 14223 |
| 6 | 105411 |
| 7 | 781873 |
| 8 | 5798587 |
| 9 | 43004317 |
| 10 | 318935945 |
| 11 | 2365343683 |
| 12 | 17542244471 |
| 13 | 130099628443 |
| 14 | 964865884537 |
| 15 | 7155794283827 |
| 16 | 53069957831125 |
| 17 | 393585996554193 |
| 18 | 2918976065097931 |
| 19 | 21648181955586463 |
| 20 | 160550745032206387 |
[3,37,257,1915,14223,105411,781873,5798587, 43004317,318935945,2365343683,17542244471, 130099628443,964865884537,7155794283827, 53069957831125,393585996554193,2918976065097931, 21648181955586463,160550745032206387] |