The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 7 |
| 5 | 11 |
| 6 | 33 |
| 7 | 73 |
| 8 | 237 |
| 9 | 703 |
| 10 | 2433 |
| 11 | 8309 |
| 12 | 30108 |
| 13 | 108991 |
| 14 | 403262 |
| 15 | 1497070 |
| 16 | 5607437 |
| 17 | 21076571 |
| 18 | 79595990 |
| 19 | 301492045 |
| 20 | 1145560579 |
| 21 | 4363503684 |
| 22 | 16660204452 |
| 23 | 63741248201 |
| 24 | 244339646708 |
| 25 | 938255682551 |
| 26 | 3608668388957 |
| 27 | 13900021844558 |
| 28 | 53614340398327 |
| 29 | 207062143625711 |
[1,1,2,3,7,11,33,73,237,703,2433,8309,30108, 108991,403262,1497070,5607437,21076571,79595990, 301492045,1145560579,4363503684,16660204452, 63741248201,244339646708,938255682551, 3608668388957,13900021844558,53614340398327, 207062143625711] |