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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 50 |
| 3 | 116 |
| 4 | 302 |
| 5 | 726 |
| 6 | 1709 |
| 7 | 3996 |
| 8 | 9346 |
| 9 | 21891 |
| 10 | 51367 |
| 11 | 120680 |
| 12 | 283746 |
| 13 | 667466 |
| 14 | 1570516 |
| 15 | 3695871 |
| 16 | 8698086 |
| 17 | 20471383 |
| 18 | 48181359 |
| 19 | 113400534 |
| 20 | 266902849 |
| 21 | 628191882 |
| 22 | 1478536037 |
| 23 | 3479939872 |
| 24 | 8190523786 |
| 25 | 19277542258 |
| 26 | 45372392065 |
| 27 | 106790273799 |
[8,50,116,302,726,1709,3996,9346,21891,51367, 120680,283746,667466,1570516,3695871,8698086, 20471383,48181359,113400534,266902849,628191882, 1478536037,3479939872,8190523786,19277542258, 45372392065,106790273799] |