The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 26 |
| 2 | 76 |
| 3 | 224 |
| 4 | 662 |
| 5 | 1960 |
| 6 | 5810 |
| 7 | 17238 |
| 8 | 51180 |
| 9 | 152040 |
| 10 | 451874 |
| 11 | 1343530 |
| 12 | 3995984 |
| 13 | 11888510 |
| 14 | 35378800 |
| 15 | 105307232 |
| 16 | 313517862 |
| 17 | 933569352 |
| 18 | 2780376498 |
| 19 | 8281841754 |
| 20 | 24672375600 |
| 21 | 73510750578 |
| 22 | 219049521636 |
| 23 | 652802078652 |
| 24 | 1945651872306 |
[1,26,76,224,662,1960,5810,17238,51180,152040, 451874,1343530,3995984,11888510,35378800, 105307232,313517862,933569352,2780376498, 8281841754,24672375600,73510750578,219049521636, 652802078652,1945651872306] |