表格开始
......1...........1.............1..............1............1..........1
......2...........6............14.............34...........92........258
......6..........74...........574...........4564........41526.....419516
.....24........1880.........68876........2316638.....94747953.4581555620
....120.......80316......18375702.....3291772332.740782304804
....720.....5141864....9213264418.10673009972228
...5040...458608016.7725775442284
..40320.54247835568
.362880