# A052744 (b-file synthesized from sequence entry) 0 0 1 0 2 0 3 6 4 48 5 840 6 17280 7 448560 8 13789440 9 491702400 10 19929369600 11 904873939200 12 45486949939200 13 2507639957222400 14 150419515915468800 15 9752720435377920000 16 679630757528346624000 17 50655177765863903232000