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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 24 |
| 4 | 97 |
| 5 | 401 |
| 6 | 1692 |
| 7 | 7409 |
| 8 | 32894 |
| 9 | 147976 |
| 10 | 673011 |
| 11 | 3091440 |
| 12 | 14317001 |
| 13 | 66635816 |
| 14 | 312060730 |
| 15 | 1469011146 |
| 16 | 6939920335 |
| 17 | 32907071979 |
| 18 | 156569859687 |
| 19 | 747072761700 |
| 20 | 3573306593321 |
| 21 | 17131688872318 |
| 22 | 82316132903829 |
| 23 | 396237598061021 |
| 24 | 1910590572871349 |
| 25 | 9227790455100265 |
| 26 | 44633040691797814 |
| 27 | 216164223668629316 |
[1,2,7,24,97,401,1692,7409,32894,147976,673011, 3091440,14317001,66635816,312060730,1469011146, 6939920335,32907071979,156569859687,747072761700, 3573306593321,17131688872318,82316132903829, 396237598061021,1910590572871349,9227790455100265, 44633040691797814,216164223668629316] |