| 数据
|
1, 1, 1, 2, 8, 36, 180, 1008, 6336, 46080, 374400, 3369600, 32659200, 344736000, 3886444800, 47348582400, 611264102400, 8442272563200, 122595843686400, 1890952003584000, 30510694932480000, 520011800985600000, 9231875243458560000, 172292221923655680000
|