The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 6 |
| 5 | 11 |
| 6 | 20 |
| 7 | 36 |
| 8 | 64 |
| 9 | 115 |
| 10 | 205 |
| 11 | 366 |
| 12 | 652 |
| 13 | 1162 |
| 14 | 2070 |
| 15 | 3687 |
| 16 | 6567 |
| 17 | 11696 |
| 18 | 20832 |
| 19 | 37103 |
| 20 | 66084 |
| 21 | 117701 |
| 22 | 209635 |
| 23 | 373375 |
| 24 | 665008 |
| 25 | 1184428 |
| 26 | 2109552 |
| 27 | 3757265 |
| 28 | 6691962 |
| 29 | 11918868 |
| 30 | 21228368 |
| 31 | 37809262 |
| 32 | 67341034 |
| 33 | 119939258 |
| 34 | 213620504 |
[1,1,2,3,6,11,20,36,64,115,205,366,652,1162,2070, 3687,6567,11696,20832,37103,66084,117701,209635, 373375,665008,1184428,2109552,3757265,6691962, 11918868,21228368,37809262,67341034,119939258, 213620504] |