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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 50 |
| 3 | 287 |
| 4 | 1725 |
| 5 | 10299 |
| 6 | 61491 |
| 7 | 367208 |
| 8 | 2192810 |
| 9 | 13094522 |
| 10 | 78194882 |
| 11 | 466946550 |
| 12 | 2788405644 |
| 13 | 16651169555 |
| 14 | 99433684945 |
| 15 | 593775569480 |
| 16 | 3545774525272 |
| 17 | 21173853607285 |
| 18 | 126441225573015 |
| 19 | 755053086743011 |
| 20 | 4508855092288477 |
[8,50,287,1725,10299,61491,367208,2192810, 13094522,78194882,466946550,2788405644, 16651169555,99433684945,593775569480, 3545774525272,21173853607285,126441225573015, 755053086743011,4508855092288477] |