The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 2 | 3 |
| 3 | 7 |
| 4 | 40 |
| 5 | 181 |
| 6 | 751 |
| 7 | 4362 |
| 8 | 30172 |
| 9 | 201561 |
| 10 | 1326983 |
| 11 | 8712861 |
| 12 | 57417550 |
| 13 | 382491765 |
| 14 | 2579276497 |
| 15 | 17577174628 |
| 16 | 120836343848 |
[3,7,40,181,751,4362,30172,201561,1326983,8712861, 57417550,382491765,2579276497,17577174628, 120836343848] |