The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 5 |
| 4 | 9 |
| 5 | 15 |
| 6 | 27 |
| 7 | 44 |
| 8 | 71 |
| 9 | 113 |
| 10 | 176 |
| 11 | 271 |
| 12 | 413 |
| 13 | 621 |
| 14 | 927 |
| 15 | 1375 |
| 16 | 2004 |
| 17 | 2924 |
| 18 | 4213 |
[1,1,3,5,9,15,27,44,71,113,176,271,413,621,927, 1375,2004,2924,4213] |