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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 21 |
| 3 | 149 |
| 4 | 526 |
| 5 | 4343 |
| 6 | 29481 |
| 7 | 227270 |
| 8 | 1748201 |
| 9 | 14230080 |
| 10 | 116070258 |
| 11 | 970291863 |
| 12 | 8167942037 |
| 13 | 69515482202 |
| 14 | 595126853497 |
| 15 | 5123195518181 |
| 16 | 44273991533826 |
| 17 | 383829145390407 |
| 18 | 3335510350046976 |
| 19 | 29039638981754848 |
| 20 | 253185283934243073 |
[8,21,149,526,4343,29481,227270,1748201,14230080, 116070258,970291863,8167942037,69515482202, 595126853497,5123195518181,44273991533826, 383829145390407,3335510350046976, 29039638981754848,253185283934243073] |