# A138533 (b-file synthesized from sequence entry) 1 1 2 2 3 1 4 6 5 3 6 1 7 24 8 12 9 4 10 1 11 6 12 120 13 60 14 20 15 5 16 1 17 30 18 10 19 720 20 360 21 120 22 30 23 6 24 1 25 180 26 60 27 15 28 20 29 90