The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 5 |
| 6 | 9 |
| 7 | 16 |
| 8 | 31 |
| 9 | 61 |
| 10 | 125 |
| 11 | 266 |
| 12 | 579 |
| 13 | 1305 |
| 14 | 3009 |
| 15 | 7120 |
| 16 | 17255 |
| 17 | 42697 |
| 18 | 108005 |
| 19 | 278466 |
| 20 | 731883 |
| 21 | 1958589 |
| 22 | 5331625 |
| 23 | 14758720 |
| 24 | 41501135 |
| 25 | 118507301 |
| 26 | 343405709 |
| 27 | 1009313322 |
| 28 | 3007557523 |
| 29 | 9081204849 |
| 30 | 27775308049 |
| 31 | 86014412384 |
| 32 | 269603741111 |
| 33 | 855012176081 |
[1,1,1,2,3,5,9,16,31,61,125,266,579,1305,3009, 7120,17255,42697,108005,278466,731883,1958589, 5331625,14758720,41501135,118507301,343405709, 1009313322,3007557523,9081204849,27775308049, 86014412384,269603741111,855012176081] |