The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 5 |
| 5 | 2 |
| 6 | 61 |
| 7 | 17 |
| 8 | 277 |
| 9 | 62 |
| 10 | 50521 |
| 11 | 1382 |
| 12 | 540553 |
| 13 | 21844 |
| 14 | 199360981 |
| 15 | 929569 |
| 16 | 3878302429 |
| 17 | 6404582 |
| 18 | 2404879675441 |
| 19 | 443861162 |
| 20 | 14814847529501 |
| 21 | 18888466084 |
| 22 | 69348874393137901 |
| 23 | 113927491862 |
| 24 | 238685140977801337 |
| 25 | 58870668456604 |
| 26 | 4087072509293123892361 |
[1,1,1,1,5,2,61,17,277,62,50521,1382,540553,21844, 199360981,929569,3878302429,6404582,2404879675441, 443861162,14814847529501,18888466084, 69348874393137901,113927491862,238685140977801337, 58870668456604,4087072509293123892361] |