The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 31082452632000 |
| 5 | 91880966659006902855367890000 |
| 6 | 4623755659802671553551698062433487687144266000 |
| 7 | 3253924815644553490177047049527865204808456401213720382274024000 |
[0,0,1,31082452632000, 91880966659006902855367890000, 4623755659802671553551698062433487687144266000, 32539248156445534901770470495278652048084564012137\ 20382274024000] |