The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 37 |
| 4 | 240 |
| 5 | 1621 |
| 6 | 11256 |
| 7 | 79717 |
| 8 | 572928 |
| 9 | 4164841 |
| 10 | 30553116 |
| 11 | 225817021 |
| 12 | 1679454816 |
| 13 | 12556853401 |
| 14 | 94313192616 |
| 15 | 711189994357 |
| 16 | 5381592930816 |
| 17 | 40848410792017 |
| 18 | 310909645663332 |
| 19 | 2372280474687277 |
| 20 | 18141232682656320 |
| 21 | 139010366280363601 |
| 22 | 1067160872528170536 |
| 23 | 8206301850166625797 |
| 24 | 63203453697218605440 |
[1,6,37,240,1621,11256,79717,572928,4164841, 30553116,225817021,1679454816,12556853401, 94313192616,711189994357,5381592930816, 40848410792017,310909645663332,2372280474687277, 18141232682656320,139010366280363601, 1067160872528170536,8206301850166625797, 63203453697218605440] |