The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 400 |
| 4 | 5364800 |
| 5 | -367374176000 |
| 6 | 143449000888960000 |
| 7 | -181899009894595069440000 |
| 8 | 627436681283593072503040000000 |
| 9 | -5107564746905573153364013194240000000 |
| 10 | 88171417366157389105207649269976371200000000 |
| 11 | -2969272543655823399308577388625291953035264000000000 |
| 12 | 182441297602875422577046590572630481727347923066880000000000 |
[1,4,400,5364800,-367374176000,143449000888960000, -181899009894595069440000, 627436681283593072503040000000, -5107564746905573153364013194240000000, 88171417366157389105207649269976371200000000, -2969272543655823399308577388625291953035264000000\ 000, 18244129760287542257704659057263048172734792306688\ 0000000000] |