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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 8 |
| 4 | 64 |
| 5 | 1023 |
| 6 | 32071 |
| 7 | 1823707 |
| 8 | 163947848 |
| 9 | 20402420291 |
| 10 | 3209997749284 |
| 11 | 604611323732576 |
| 12 | 131861300077834966 |
| 13 | 32577569614176693919 |
| 14 | 8977083127683999891824 |
| 15 | 2726955513946123452637877 |
| 16 | 904755724004585279250537376 |
| 17 | 325403988657293080813790670641 |
[1,1,2,8,64,1023,32071,1823707,163947848, 20402420291,3209997749284,604611323732576, 131861300077834966,32577569614176693919, 8977083127683999891824,2726955513946123452637877, 904755724004585279250537376, 325403988657293080813790670641] |