The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 11 |
| 4 | 29 |
| 5 | 87 |
| 6 | 217 |
| 7 | 608 |
| 8 | 1563 |
| 9 | 4168 |
| 10 | 10854 |
| 11 | 28655 |
| 12 | 74763 |
| 13 | 196416 |
| 14 | 513616 |
| 15 | 1346169 |
| 16 | 3522981 |
| 17 | 9227463 |
| 18 | 24153416 |
| 19 | 63245984 |
| 20 | 165569166 |
| 21 | 433493816 |
| 22 | 1134874510 |
| 23 | 2971215071 |
| 24 | 7778665461 |
| 25 | 20365010985 |
| 26 | 53316094752 |
| 27 | 139583858264 |
| 28 | 365434781904 |
| 29 | 956722026039 |
| 30 | 2504729424618 |
[2,3,11,29,87,217,608,1563,4168,10854,28655,74763, 196416,513616,1346169,3522981,9227463,24153416, 63245984,165569166,433493816,1134874510, 2971215071,7778665461,20365010985,53316094752, 139583858264,365434781904,956722026039, 2504729424618] |