The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 443088 |
| 4 | 46957788 |
| 5 | 1008327378 |
| 6 | 25162747992 |
| 7 | 271906503420 |
| 8 | 2992465755612 |
| 9 | 20367499465482 |
| 10 | 129329174634672 |
| 11 | 624840436639956 |
| 12 | 2766099092355012 |
| 13 | 10373656913823810 |
| 14 | 35810603737855596 |
| 15 | 111074891756040534 |
[0,0,443088,46957788,1008327378,25162747992, 271906503420,2992465755612,20367499465482, 129329174634672,624840436639956,2766099092355012, 10373656913823810,35810603737855596, 111074891756040534] |