# A227460 (b-file synthesized from sequence entry) 1 1 2 2 3 12 4 112 5 1440 6 23664 7 473984 8 11203200 9 305268480 10 9421739520 11 324874716672 12 12377880797184 13 516412532213760 14 23414906122352640 15 1146462496418119680 16 60286544709800361984 17 3388531521749583790080 18 202734601173679682027520 19 12863997904326532359782400