The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 7 |
| 6 | 13 |
| 7 | 17 |
| 8 | 30 |
| 9 | 60 |
| 10 | 107 |
| 11 | 197 |
| 12 | 257 |
| 13 | 454 |
| 14 | 908 |
| 15 | 1619 |
| 16 | 2981 |
| 17 | 3889 |
| 18 | 6870 |
| 19 | 13740 |
| 20 | 24499 |
| 21 | 45109 |
| 22 | 58849 |
| 23 | 103958 |
| 24 | 207916 |
| 25 | 370723 |
| 26 | 682597 |
| 27 | 890513 |
| 28 | 1573110 |
| 29 | 3146220 |
| 30 | 5609843 |
| 31 | 10329173 |
| 32 | 13475393 |
| 33 | 23804566 |
| 34 | 47609132 |
| 35 | 84889091 |
| 36 | 156302789 |
[1,1,2,4,7,13,17,30,60,107,197,257,454,908,1619, 2981,3889,6870,13740,24499,45109,58849,103958, 207916,370723,682597,890513,1573110,3146220, 5609843,10329173,13475393,23804566,47609132, 84889091,156302789] |