# A318245 (b-file synthesized from sequence entry) 0 1 1 12 2 180 3 2928 4 49860 5 875952 6 15754704 7 288722880 8 5373771876 9 101334517680 10 1932405892560 11 37208369165760 12 722497419680400 13 14132680228175040 14 278236490874120000 15 5508974545258860288 16 109624581377872629156 17 2191185332414847848880 18 43971545517545956240464