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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 57 |
| 3 | 71 |
| 4 | 365 |
| 5 | 1867 |
| 6 | 6518 |
| 7 | 41303 |
| 8 | 312366 |
| 9 | 1912290 |
| 10 | 13719646 |
| 11 | 105507600 |
| 12 | 756118238 |
| 13 | 5541109762 |
| 14 | 41556437443 |
| 15 | 306591406483 |
| 16 | 2263972269500 |
| 17 | 16828302894659 |
| 18 | 124701731108789 |
| 19 | 923337868747664 |
| 20 | 6848020047283788 |
| 21 | 50766762668647708 |
[8,57,71,365,1867,6518,41303,312366,1912290, 13719646,105507600,756118238,5541109762, 41556437443,306591406483,2263972269500, 16828302894659,124701731108789,923337868747664, 6848020047283788,50766762668647708] |