The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 5 |
| 6 | 9 |
| 7 | 12 |
| 8 | 21 |
| 9 | 37 |
| 10 | 65 |
| 11 | 114 |
| 12 | 200 |
| 13 | 265 |
| 14 | 465 |
| 15 | 816 |
| 16 | 1432 |
| 17 | 2513 |
| 18 | 4410 |
| 19 | 5842 |
| 20 | 10252 |
| 21 | 17991 |
| 22 | 31572 |
| 23 | 55405 |
| 24 | 97229 |
| 25 | 128801 |
| 26 | 226030 |
| 27 | 396655 |
| 28 | 696081 |
| 29 | 1221537 |
| 30 | 2143648 |
| 31 | 3761840 |
| 32 | 4983377 |
| 33 | 8745217 |
| 34 | 15346786 |
| 35 | 26931732 |
| 36 | 47261895 |
| 37 | 82938844 |
| 38 | 109870576 |
[0,1,2,3,5,9,12,21,37,65,114,200,265,465,816,1432, 2513,4410,5842,10252,17991,31572,55405,97229, 128801,226030,396655,696081,1221537,2143648, 3761840,4983377,8745217,15346786,26931732, 47261895,82938844,109870576] |