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| n | a(n) |
|---|---|
| 1 | 256 |
| 2 | 1632 |
| 3 | 10316 |
| 4 | 66512 |
| 5 | 431640 |
| 6 | 2776536 |
| 7 | 17920936 |
| 8 | 115383848 |
| 9 | 745952272 |
| 10 | 4801239096 |
| 11 | 31023158644 |
| 12 | 199699207808 |
| 13 | 1290589180896 |
| 14 | 8307345571648 |
| 15 | 53684274618860 |
| 16 | 345562572268528 |
| 17 | 2233164262251368 |
| 18 | 14374690362585720 |
[256,1632,10316,66512,431640,2776536,17920936, 115383848,745952272,4801239096,31023158644, 199699207808,1290589180896,8307345571648, 53684274618860,345562572268528,2233164262251368, 14374690362585720] |