# A162811 (b-file synthesized from sequence entry) 0 1 1 25 2 600 3 14100 4 331200 5 7776300 6 182580900 7 4286804400 8 100649603100 9 2363145044100 10 55484118871200 11 1302707779596300 12 30586185632580900 13 718130931671624400 14 16860946350828143100 15 395876990262902324100