# A018710 (b-file synthesized from sequence entry) 1 1 2 2 3 3 4 4 5 5 6 6 7 9 8 10 9 12 10 15 11 18 12 20 13 25 14 30 15 36 16 45 17 50 18 60 19 75 20 90 21 100 22 150 23 180 24 225 25 300 26 450 27 900