# A350113 (b-file synthesized from sequence entry) 1 1 2 2 3 6 4 24 5 120 6 720 7 5040 8 45360 9 498960 10 6486480 11 110270160 12 2095133040 13 41902660800 14 963761198400 15 26985313555200 16 782574093100800 17 24259796886124800 18 897612484786617600 19 36802111876251321600 20 1582490810678806828800 21 74377068101903920953600 22 3941984609400907810540800