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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 13 |
| 2 | 82 |
| 3 | 513 |
| 4 | 3202 |
| 5 | 19973 |
| 6 | 124562 |
| 7 | 776793 |
| 8 | 4844162 |
| 9 | 30208573 |
| 10 | 188382802 |
| 11 | 1174768113 |
| 12 | 7325934082 |
| 13 | 45685023413 |
| 14 | 284894912402 |
| 15 | 1776624041673 |
| 16 | 11079148296962 |
| 17 | 69090321917293 |
| 18 | 430851944071762 |
| 19 | 2686822011483873 |
[2,13,82,513,3202,19973,124562,776793,4844162, 30208573,188382802,1174768113,7325934082, 45685023413,284894912402,1776624041673, 11079148296962,69090321917293,430851944071762, 2686822011483873] |