The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 7 |
| 7 | 19 |
| 8 | 37 |
| 9 | 61 |
| 10 | 206 |
| 11 | 1719 |
| 12 | 10844 |
| 13 | 47433 |
| 14 | 196187 |
| 15 | 1471074 |
| 16 | 18683007 |
| 17 | 235351208 |
| 18 | 2409858057 |
| 19 | 25820260434 |
| 20 | 404318889964 |
| 21 | 8981163778542 |
[1,7,19,37,61,206,1719,10844,47433,196187,1471074, 18683007,235351208,2409858057,25820260434, 404318889964,8981163778542] |