# A027486 (b-file synthesized from sequence entry) 1 1 2 3 3 23 4 330 5 7604 6 256620 7 11923260 8 729524880 9 56840099904 10 5493503695680 11 644870893060800 12 90366972897801600 13 14899694352066120960 14 2855250418022402400000 15 629258349435218754451200 16 158034681938560927788288000 17 44866854739192779425625292800