The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 10 |
| 4 | 30 |
| 5 | 96 |
| 6 | 307 |
| 7 | 981 |
| 8 | 3137 |
| 9 | 10034 |
| 10 | 32096 |
| 11 | 102669 |
| 12 | 328423 |
| 13 | 1050581 |
| 14 | 3360673 |
| 15 | 10750367 |
| 16 | 34389071 |
| 17 | 110006322 |
| 18 | 351896433 |
| 19 | 1125672593 |
| 20 | 3600885592 |
| 21 | 11518781894 |
| 22 | 36847140260 |
| 23 | 117869385707 |
| 24 | 377049398986 |
| 25 | 1206133793206 |
| 26 | 3858270908444 |
[1,3,10,30,96,307,981,3137,10034,32096,102669, 328423,1050581,3360673,10750367,34389071, 110006322,351896433,1125672593,3600885592, 11518781894,36847140260,117869385707,377049398986, 1206133793206,3858270908444] |