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| n | a(n) |
|---|---|
| 0 | 8 |
| 1 | 55 |
| 2 | 379 |
| 3 | 2612 |
| 4 | 18002 |
| 5 | 124071 |
| 6 | 855106 |
| 7 | 5893451 |
| 8 | 40618081 |
| 9 | 279942687 |
| 10 | 1929384798 |
| 11 | 13297456486 |
| 12 | 91647010581 |
| 13 | 631637678776 |
| 14 | 4353291555505 |
| 15 | 30003193292641 |
| 16 | 206784130187015 |
| 17 | 1425170850320396 |
| 18 | 9822378297435246 |
| 19 | 67696525926163327 |
| 20 | 466569244606302614 |
[8,55,379,2612,18002,124071,855106,5893451, 40618081,279942687,1929384798,13297456486, 91647010581,631637678776,4353291555505, 30003193292641,206784130187015,1425170850320396, 9822378297435246,67696525926163327, 466569244606302614] |