The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 1 |
| 8 | 1 |
| 9 | 1 |
| 10 | 1 |
| 11 | 1 |
| 12 | 1 |
| 13 | 3 |
| 14 | 3 |
| 15 | 9 |
| 16 | 9 |
| 17 | 19 |
| 18 | 19 |
| 19 | 59 |
| 20 | 59 |
| 21 | 237 |
| 22 | 237 |
| 23 | 1193 |
| 24 | 1193 |
| 25 | 6925 |
| 26 | 6925 |
| 27 | 46535 |
| 28 | 46535 |
| 29 | 385115 |
| 30 | 385115 |
[1,1,1,1,1,1,1,1,1,1,1,1,3,3,9,9,19,19,59,59,237, 237,1193,1193,6925,6925,46535,46535,385115,385115] |