The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 7 |
| 7 | 22 |
| 8 | 57 |
| 9 | 127 |
| 10 | 259 |
| 11 | 529 |
| 12 | 1189 |
| 13 | 3004 |
| 14 | 8009 |
| 15 | 21073 |
| 16 | 53233 |
| 17 | 129813 |
| 18 | 312733 |
| 19 | 763573 |
| 20 | 1915251 |
| 21 | 4914736 |
| 22 | 12720841 |
| 23 | 32800186 |
| 24 | 83869501 |
| 25 | 213261712 |
| 26 | 542609237 |
| 27 | 1388542312 |
| 28 | 3579043987 |
| 29 | 9273567337 |
| 30 | 24075321925 |
| 31 | 62475528190 |
| 32 | 161969731985 |
| 33 | 419914766965 |
[1,1,1,1,1,2,7,22,57,127,259,529,1189,3004,8009, 21073,53233,129813,312733,763573,1915251,4914736, 12720841,32800186,83869501,213261712,542609237, 1388542312,3579043987,9273567337,24075321925, 62475528190,161969731985,419914766965] |