The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 6 |
| 3 | 1680 |
| 4 | 5562130 |
| 5 | 248832363780 |
| 6 | 157933807781230404 |
| 7 | 1459371378373349655614400 |
| 8 | 199540356506880704345957381087490 |
| 9 | 408278793226256174470138460253382778465100 |
| 10 | 12605249484391847030759523774663513363531264829120276 |
[1,0,6,1680,5562130,248832363780, 157933807781230404,1459371378373349655614400, 199540356506880704345957381087490, 408278793226256174470138460253382778465100, 12605249484391847030759523774663513363531264829120\ 276] |