The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 0 |
| 4 | 2 |
| 5 | 2 |
| 6 | 8 |
| 7 | 7 |
| 8 | 22 |
| 9 | 27 |
| 10 | 68 |
| 11 | 80 |
| 12 | 235 |
| 13 | 343 |
| 14 | 844 |
| 15 | 1180 |
| 16 | 2849 |
| 17 | 4473 |
| 18 | 10138 |
| 19 | 15387 |
| 20 | 37023 |
| 21 | 58714 |
| 22 | 134477 |
| 23 | 213397 |
| 24 | 494625 |
| 25 | 802311 |
| 26 | 1829183 |
| 27 | 2965114 |
| 28 | 6789809 |
| 29 | 11185644 |
| 30 | 25412867 |
| 31 | 42048314 |
| 32 | 95440507 |
| 33 | 159433693 |
[0,1,0,2,2,8,7,22,27,68,80,235,343,844,1180,2849, 4473,10138,15387,37023,58714,134477,213397,494625, 802311,1829183,2965114,6789809,11185644,25412867, 42048314,95440507,159433693] |