# A252997 (b-file synthesized from sequence entry) 1 218 2 189648 3 720240 4 119967120 5 129705984 6 517941905 7 707902440 8 1321744320 9 98890370304 10 99080219520 11 119922568640 12 139834382688 13 347612467648 14 580542318720 15 952717920000 16 1064902900320 17 1153644808680 18 2255573174400 19 3903820736256 20 6859688278905 21 10944640212480 22 14424196864000