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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 29 |
| 3 | 459 |
| 4 | 1843 |
| 5 | 14723 |
| 6 | 58925 |
| 7 | 1885171 |
| 8 | 7541399 |
| 9 | 60328761 |
| 10 | 241319243 |
| 11 | 3861078495 |
| 12 | 15444365983 |
| 13 | 123554742139 |
| 14 | 494219302861 |
| 15 | 31630025688259 |
| 16 | 126520120431871 |
| 17 | 1012160898632573 |
| 18 | 4048643713939967 |
| 19 | 64778298539407877 |
[1,7,29,459,1843,14723,58925,1885171,7541399, 60328761,241319243,3861078495,15444365983, 123554742139,494219302861,31630025688259, 126520120431871,1012160898632573,4048643713939967, 64778298539407877] |