# A233004 (b-file synthesized from sequence entry) 1 0 2 1 3 0 4 12 5 60 6 540 7 0 8 20160 9 181440 10 907200 11 19958400 12 359251200 13 1556755200 14 32691859200 15 0 16 10461394944000 17 177843714048000 18 1600593426432000 19 60822550204416000 20 608225502044160000 21 38318206628782080000 22 702500454861004800000 23 12926008369442488320000