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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 41 |
| 3 | 181 |
| 4 | 780 |
| 5 | 3193 |
| 6 | 12529 |
| 7 | 51113 |
| 8 | 204137 |
| 9 | 818845 |
| 10 | 3278537 |
| 11 | 13127189 |
| 12 | 52527041 |
| 13 | 210117945 |
| 14 | 840405657 |
| 15 | 3362228924 |
[1,8,41,181,780,3193,12529,51113,204137,818845, 3278537,13127189,52527041,210117945,840405657, 3362228924] |