The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 7 |
| 5 | 13 |
| 6 | 23 |
| 7 | 42 |
| 8 | 77 |
| 9 | 132 |
| 10 | 241 |
| 11 | 438 |
| 12 | 742 |
| 13 | 1348 |
| 14 | 2435 |
| 15 | 4102 |
| 16 | 7418 |
| 17 | 13341 |
| 18 | 22406 |
| 19 | 40372 |
| 20 | 72374 |
| 21 | 121329 |
| 22 | 218010 |
| 23 | 389884 |
| 24 | 652835 |
| 25 | 1170571 |
| 26 | 2089623 |
| 27 | 3496107 |
| 28 | 6258591 |
| 29 | 11156898 |
| 30 | 18655662 |
| 31 | 33355003 |
| 32 | 59396679 |
| 33 | 99276601 |
[1,1,2,4,7,13,23,42,77,132,241,438,742,1348,2435, 4102,7418,13341,22406,40372,72374,121329,218010, 389884,652835,1170571,2089623,3496107,6258591, 11156898,18655662,33355003,59396679,99276601] |