The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 5 |
| 4 | 35 |
| 5 | 330 |
| 6 | 715 |
| 7 | 2380 |
| 8 | 3876 |
| 9 | 8855 |
| 10 | 23751 |
| 11 | 31465 |
| 12 | 66045 |
| 13 | 101270 |
| 14 | 123410 |
| 15 | 178365 |
| 16 | 292825 |
| 17 | 455126 |
| 18 | 521855 |
| 19 | 766480 |
| 20 | 971635 |
| 21 | 1088430 |
| 22 | 1502501 |
| 23 | 1837620 |
| 24 | 2441626 |
| 25 | 3464840 |
| 26 | 4082925 |
| 27 | 4421275 |
| 28 | 5160610 |
| 29 | 5563251 |
| 30 | 6438740 |
| 31 | 10334625 |
| 32 | 11716640 |
| 33 | 14043870 |
[0,0,5,35,330,715,2380,3876,8855,23751,31465, 66045,101270,123410,178365,292825,455126,521855, 766480,971635,1088430,1502501,1837620,2441626, 3464840,4082925,4421275,5160610,5563251,6438740, 10334625,11716640,14043870] |