The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 2 |
| 3 | 9 |
| 4 | 8 |
| 5 | 130 |
| 6 | 1134 |
| 7 | -252 |
| 8 | 29504 |
| 9 | 447480 |
| 10 | -1837800 |
| 11 | 14172840 |
| 12 | 471846792 |
| 13 | -4864408848 |
| 14 | 14099478288 |
| 15 | 1166776034760 |
| 16 | -18687216197760 |
| 17 | 31767501808320 |
| 18 | 5630793922569024 |
| 19 | -113411010324632832 |
| 20 | 156669582211562880 |
[1,0,2,9,8,130,1134,-252,29504,447480,-1837800, 14172840,471846792,-4864408848,14099478288, 1166776034760,-18687216197760,31767501808320, 5630793922569024,-113411010324632832, 156669582211562880] |