# A179936 (b-file synthesized from sequence entry) 1 1 2 0 3 6 4 0 5 540 6 0 7 156240 8 0 9 96480720 10 0 11 104661849600 12 0 13 177947471782080 14 0 15 439942718370355200 16 0 17 1499983925770422892800 18 0 19 6780179728814814933811200 20 0 21 39412342523061395825857920000 22 0