# A012803 (b-file synthesized from sequence entry) 0 1 1 2 2 48 3 1080 4 112000 5 9941120 6 2204340864 7 473940603136 8 177280211177472 9 70742192264802304 10 40258836839175946240 11 25560794070720075464704 12 20755313571874776988942336 13 19066653840381485832858304512