# A028580 (b-file synthesized from sequence entry)
1 1
2 2
3 10
4 280
5 235200
6 173859840000
7 98238542885683200000000
8 32169371027674057560745102540800000000000000000
9 3518552669874927170883258602839130084576857453953842493259776000000000000000000000000000000000