The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 68 |
| 3 | 314 |
| 4 | 2281 |
| 5 | 14201 |
| 6 | 88808 |
| 7 | 573119 |
| 8 | 3613793 |
| 9 | 22999331 |
| 10 | 146183595 |
| 11 | 928047561 |
| 12 | 5898371728 |
| 13 | 37468267405 |
| 14 | 238038322708 |
| 15 | 1512327060362 |
| 16 | 9607753234896 |
| 17 | 61039432234655 |
| 18 | 387788945511548 |
| 19 | 2463656446529920 |
| 20 | 15651856594703719 |
[7,68,314,2281,14201,88808,573119,3613793, 22999331,146183595,928047561,5898371728, 37468267405,238038322708,1512327060362, 9607753234896,61039432234655,387788945511548, 2463656446529920,15651856594703719] |