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 | 15 |
| 6 | 25 |
| 7 | 49 |
| 8 | 79 |
| 9 | 154 |
| 10 | 248 |
| 11 | 453 |
| 12 | 748 |
| 13 | 1305 |
| 14 | 2125 |
| 15 | 3702 |
| 16 | 5931 |
| 17 | 9990 |
| 18 | 16415 |
| 19 | 26844 |
| 20 | 43246 |
| 21 | 70947 |
| 22 | 113653 |
| 23 | 182314 |
| 24 | 292897 |
| 25 | 464614 |
| 26 | 739640 |
| 27 | 1169981 |
| 28 | 1844511 |
| 29 | 2888427 |
| 30 | 4562850 |
| 31 | 7079798 |
| 32 | 11064182 |
| 33 | 17158151 |
| 34 | 26676385 |
| 35 | 41075556 |
| 36 | 63598025 |
| 37 | 97420873 |
| 38 | 150043132 |
[1,1,2,4,7,15,25,49,79,154,248,453,748,1305,2125, 3702,5931,9990,16415,26844,43246,70947,113653, 182314,292897,464614,739640,1169981,1844511, 2888427,4562850,7079798,11064182,17158151, 26676385,41075556,63598025,97420873,150043132] |