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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 19 |
| 2 | 125 |
| 3 | 853 |
| 4 | 6017 |
| 5 | 43669 |
| 6 | 324425 |
| 7 | 2455213 |
| 8 | 18847457 |
| 9 | 146248549 |
| 10 | 1143973625 |
| 11 | 9001559773 |
| 12 | 71140399697 |
| 13 | 564037211029 |
| 14 | 4482514190825 |
| 15 | 35685074651533 |
| 16 | 284448674508737 |
| 17 | 2269489412583109 |
| 18 | 18119773163416025 |
| 19 | 144743621302194493 |
[3,19,125,853,6017,43669,324425,2455213,18847457, 146248549,1143973625,9001559773,71140399697, 564037211029,4482514190825,35685074651533, 284448674508737,2269489412583109, 18119773163416025,144743621302194493] |