# A069651 (b-file synthesized from sequence entry)
0 1
1 2
2 18
3 1200
4 735000
5 4667544000
6 332086420512000
7 279394363051195392000
8 2892376010829659126572800000
9 379850021025259936655866602240000000
10 648304836222110631242066578424390188032000000