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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 34 |
| 3 | 111 |
| 4 | 882 |
| 5 | 3621 |
| 6 | 22971 |
| 7 | 138924 |
| 8 | 684002 |
| 9 | 3547662 |
| 10 | 21119073 |
| 11 | 123417309 |
| 12 | 672321817 |
| 13 | 3625436742 |
| 14 | 20487480586 |
| 15 | 116748710539 |
| 16 | 650239402498 |
| 17 | 3588244785640 |
| 18 | 20046900212152 |
| 19 | 112856868883812 |
| 20 | 631362977595367 |
[8,34,111,882,3621,22971,138924,684002,3547662, 21119073,123417309,672321817,3625436742, 20487480586,116748710539,650239402498, 3588244785640,20046900212152,112856868883812, 631362977595367] |