The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 14 |
| 4 | 45 |
| 5 | 155 |
| 6 | 553 |
| 7 | 2049 |
| 8 | 7832 |
| 9 | 30577 |
| 10 | 121584 |
| 11 | 491526 |
| 12 | 2013629 |
| 13 | 8342993 |
| 14 | 34924457 |
| 15 | 147498787 |
| 16 | 627773947 |
| 17 | 2690792993 |
| 18 | 11606230826 |
| 19 | 50343025311 |
| 20 | 219495098281 |
| 21 | 961494709417 |
| 22 | 4229766776044 |
| 23 | 18680738398857 |
| 24 | 82803011897563 |
| 25 | 368252104098982 |
| 26 | 1642825151126609 |
| 27 | 7350053482843933 |
[1,2,5,14,45,155,553,2049,7832,30577,121584, 491526,2013629,8342993,34924457,147498787, 627773947,2690792993,11606230826,50343025311, 219495098281,961494709417,4229766776044, 18680738398857,82803011897563,368252104098982, 1642825151126609,7350053482843933] |