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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 17 |
| 2 | 115 |
| 3 | 881 |
| 4 | 7267 |
| 5 | 62417 |
| 6 | 547795 |
| 7 | 4863281 |
| 8 | 43443907 |
| 9 | 389393297 |
| 10 | 3496609075 |
| 11 | 31430064881 |
| 12 | 282674208547 |
| 13 | 2543088125777 |
| 14 | 22882900753555 |
| 15 | 205921664021681 |
| 16 | 1853172819789187 |
| 17 | 16677944768259857 |
| 18 | 150098450381685235 |
[3,17,115,881,7267,62417,547795,4863281,43443907, 389393297,3496609075,31430064881,282674208547, 2543088125777,22882900753555,205921664021681, 1853172819789187,16677944768259857, 150098450381685235] |