The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 5 |
| 4 | 37 |
| 5 | 37 |
| 6 | 187 |
| 7 | 187 |
| 8 | 821 |
| 9 | 821 |
| 10 | 821 |
| 11 | 821 |
| 12 | 13301 |
| 13 | 13301 |
| 14 | 109941 |
| 15 | 109941 |
| 16 | 522717 |
| 17 | 522717 |
| 18 | 522717 |
| 19 | 522717 |
| 20 | 1247282901 |
| 21 | 1247282901 |
[1,5,5,37,37,187,187,821,821,821,821,13301,13301, 109941,109941,522717,522717,522717,522717, 1247282901,1247282901] |