# A189842 (b-file synthesized from sequence entry) 1 1 2 2 3 6 4 24 5 120 6 720 7 4800 8 34752 9 280512 10 2528256 11 25282560 12 278323200 13 3242649600 14 40330371072 15 536528954880 16 7633092132864