The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 12 |
| 6 | 88 |
| 7 | 364 |
| 8 | 1120 |
| 9 | 2876 |
| 10 | 6432 |
| 11 | 13116 |
| 12 | 24640 |
| 13 | 43800 |
| 14 | 73656 |
| 15 | 119160 |
| 16 | 185616 |
| 17 | 281064 |
| 18 | 413008 |
| 19 | 594888 |
| 20 | 836784 |
| 21 | 1157812 |
| 22 | 1573912 |
| 23 | 2109844 |
| 24 | 2784608 |
| 25 | 3638980 |
| 26 | 4693888 |
| 27 | 5996612 |
| 28 | 7583488 |
| 29 | 9514336 |
| 30 | 11822904 |
| 31 | 14603264 |
| 32 | 17886272 |
| 33 | 21778080 |
[0,0,0,0,12,88,364,1120,2876,6432,13116,24640, 43800,73656,119160,185616,281064,413008,594888, 836784,1157812,1573912,2109844,2784608,3638980, 4693888,5996612,7583488,9514336,11822904,14603264, 17886272,21778080] |