# A085895 (b-file synthesized from sequence entry) 0 1 1 2 2 12 3 1680 4 2162160 5 73440 6 96909120 7 424097856000 8 5339572260422400 9 57407703889536000 10 1573144097507348889600 11 89247024757574635311360000 12 131197375012291112448000 13 6932022668773077815267328000