The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 4 |
| 3 | 6 |
| 4 | 13 |
| 5 | 15 |
| 6 | 43 |
| 7 | 47 |
| 8 | 239 |
| 9 | 7199 |
| 10 | 16559 |
| 11 | 21599 |
| 12 | 33119 |
| 13 | 45359 |
| 14 | 60479 |
| 15 | 90719 |
| 16 | 1179359 |
[0,4,6,13,15,43,47,239,7199,16559,21599,33119, 45359,60479,90719,1179359] |