The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 9 | 764 |
| 10 | 2031 |
| 11 | 5741 |
| 12 | 17088 |
| 13 | 52540 |
| 14 | 168172 |
| 15 | 551142 |
| 16 | 1866639 |
| 17 | 6448956 |
| 18 | 22908742 |
| 19 | 82853921 |
| 20 | 306971909 |
| 21 | 1156564466 |
| 22 | 4451496217 |
| 23 | 17407985332 |
| 24 | 69394132575 |
| 25 | 280851149296 |
| 26 | 1156692921549 |
| 27 | 4833132867603 |
| 28 | 20521962586186 |
| 29 | 88343703440840 |
| 30 | 386014928037316 |
| 31 | 1708872377386105 |
[764,2031,5741,17088,52540,168172,551142,1866639, 6448956,22908742,82853921,306971909,1156564466, 4451496217,17407985332,69394132575,280851149296, 1156692921549,4833132867603,20521962586186, 88343703440840,386014928037316,1708872377386105] |