The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 256 |
| 3 | 204800 |
| 4 | 1331200000 |
| 5 | 51224576000000 |
| 6 | 9249109442560000000 |
| 7 | 6561595711835340800000000 |
| 8 | 15895655898196756312883200000000 |
| 9 | 117344147980184981008663340646400000000 |
[4,256,204800,1331200000,51224576000000, 9249109442560000000,6561595711835340800000000, 15895655898196756312883200000000, 117344147980184981008663340646400000000] |