The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 12 |
| 3 | 15 |
| 4 | 21 |
| 5 | 24 |
| 6 | 28 |
| 7 | 36 |
| 8 | 52 |
| 9 | 68 |
| 10 | 76 |
| 11 | 265 |
| 12 | 295 |
| 13 | 2681 |
| 14 | 8104 |
| 15 | 21413 |
| 16 | 174757 |
| 17 | 1302197 |
| 18 | 15536176 |
| 19 | 20149241 |
| 20 | 25873648 |
| 21 | 237875719 |
| 22 | 358334927 |
[6,12,15,21,24,28,36,52,68,76,265,295,2681,8104, 21413,174757,1302197,15536176,20149241,25873648, 237875719,358334927] |