# A018609 (b-file synthesized from sequence entry) 1 1 2 2 3 3 4 4 5 5 6 6 7 8 8 9 9 10 10 12 11 15 12 16 13 18 14 20 15 24 16 30 17 36 18 40 19 45 20 48 21 60 22 72 23 80 24 90 25 120 26 144 27 180 28 240 29 360 30 720