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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 18 |
| 2 | 299 |
| 3 | 4957 |
| 4 | 82176 |
| 5 | 1362293 |
| 6 | 22583749 |
| 7 | 374387682 |
| 8 | 6206504351 |
| 9 | 102889860193 |
| 10 | 1705682092824 |
| 11 | 28276366556657 |
| 12 | 468758456813401 |
| 13 | 7770959199931218 |
| 14 | 128824997201136899 |
| 15 | 2135628238019808757 |
| 16 | 35403905065928790576 |
| 17 | 586916988454650778493 |
| 18 | 9729761468267561700349 |
| 19 | 161297526041365993456482 |
[1,18,299,4957,82176,1362293,22583749,374387682, 6206504351,102889860193,1705682092824, 28276366556657,468758456813401,7770959199931218, 128824997201136899,2135628238019808757, 35403905065928790576,586916988454650778493, 9729761468267561700349,161297526041365993456482] |