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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 128 |
| 3 | 833 |
| 4 | 6206 |
| 5 | 43588 |
| 6 | 314989 |
| 7 | 2257439 |
| 8 | 16185343 |
| 9 | 116204095 |
| 10 | 833483135 |
| 11 | 5980966891 |
| 12 | 42913914839 |
| 13 | 307909560484 |
| 14 | 2209334749489 |
| 15 | 15852297971877 |
| 16 | 113743491247020 |
| 17 | 816131893706879 |
| 18 | 5855905976037061 |
| 19 | 42017301642505309 |
[8,128,833,6206,43588,314989,2257439,16185343, 116204095,833483135,5980966891,42913914839, 307909560484,2209334749489,15852297971877, 113743491247020,816131893706879,5855905976037061, 42017301642505309] |