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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 52 |
| 3 | 328 |
| 4 | 2144 |
| 5 | 14220 |
| 6 | 104404 |
| 7 | 811604 |
| 8 | 7103748 |
| 9 | 67274976 |
| 10 | 713213320 |
| 11 | 8295727284 |
| 12 | 106973119052 |
| 13 | 1531000108588 |
[8,52,328,2144,14220,104404,811604,7103748, 67274976,713213320,8295727284,106973119052, 1531000108588] |