The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 15 |
| 3 | 22 |
| 4 | 39 |
| 5 | 33 |
| 6 | 291 |
| 7 | 23174 |
| 8 | 90137 |
| 9 | 119135 |
| 10 | 1641362 |
| 11 | 1641337 |
| 12 | 7113362 |
| 13 | 471779113 |
[1,4,15,22,39,33,291,23174,90137,119135,1641362, 1641337,7113362,471779113] |