The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 4 | 0 |
| 5 | 1 |
| 6 | 1 |
| 7 | 3 |
| 8 | 8 |
| 9 | 23 |
| 10 | 61 |
| 11 | 167 |
| 12 | 461 |
| 13 | 1285 |
| 14 | 3587 |
| 15 | 10069 |
| 16 | 28350 |
| 17 | 80101 |
| 18 | 226861 |
| 19 | 644064 |
| 20 | 1832113 |
| 21 | 5221138 |
| 22 | 14902620 |
| 23 | 42597586 |
| 24 | 121917123 |
| 25 | 349343846 |
| 26 | 1002080752 |
| 27 | 2877234480 |
| 28 | 8268665140 |
| 29 | 23782254063 |
| 30 | 68454314588 |
| 31 | 197176382059 |
| 32 | 568320901793 |
| 33 | 1639070974728 |
| 34 | 4729877188814 |
[0,1,1,3,8,23,61,167,461,1285,3587,10069,28350, 80101,226861,644064,1832113,5221138,14902620, 42597586,121917123,349343846,1002080752, 2877234480,8268665140,23782254063,68454314588, 197176382059,568320901793,1639070974728, 4729877188814] |