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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 8 |
| 3 | 11 |
| 4 | 34 |
| 5 | 310 |
| 6 | 1688 |
| 7 | 2307 |
| 8 | 2708 |
| 9 | 13988 |
| 10 | 21315 |
| 11 | 46739 |
| 12 | 426378 |
| 13 | 771476 |
| 14 | 11762557 |
| 15 | 18628390 |
| 16 | 19841526 |
| 17 | 24396168 |
| 18 | 85110245 |
[1,8,11,34,310,1688,2307,2708,13988,21315,46739, 426378,771476,11762557,18628390,19841526,24396168, 85110245] |