The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 8 |
| 5 | 27 |
| 6 | 91 |
| 7 | 350 |
| 8 | 1376 |
| 9 | 5743 |
| 10 | 24635 |
| 11 | 108968 |
| 12 | 492180 |
| 13 | 2266502 |
| 14 | 10598452 |
| 15 | 50235931 |
| 16 | 240872654 |
| 17 | 1166732814 |
| 18 | 5702001435 |
| 19 | 28088787314 |
| 20 | 139354922608 |
| 21 | 695808554300 |
| 22 | 3494390057212 |
| 23 | 17641695461662 |
| 24 | 89495023510876 |
| 25 | 456009893224285 |
| 26 | 2332997330210440 |
[1,1,3,8,27,91,350,1376,5743,24635,108968,492180, 2266502,10598452,50235931,240872654,1166732814, 5702001435,28088787314,139354922608,695808554300, 3494390057212,17641695461662,89495023510876, 456009893224285,2332997330210440] |