| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 113400 |
| 3 | 32901422400 |
| 4 | 67651716132000000 |
| 5 | 608762379843757339200000 |
| 6 | 17903325789347617610786995200000 |
| 7 | 1415199921956087613201896962521600000000 |
| 8 | 261375521452474271183649591888039276441600000000 |
| 9 | 101519644940256627137917269623207295713536128000000000000 |
| 10 | 76392226231236455854222646891536244623780022885776896000000000000 |
[1,6,113400,32901422400,67651716132000000, 608762379843757339200000, 17903325789347617610786995200000, 1415199921956087613201896962521600000000, 261375521452474271183649591888039276441600000000, 10151964494025662713791726962320729571353612800000\ 0000000, 76392226231236455854222646891536244623780022885776\ 896000000000000] |