# A018541 (b-file synthesized from sequence entry) 1 1 2 2 3 3 4 4 5 5 6 6 7 8 8 10 9 12 10 15 11 20 12 24 13 25 14 30 15 40 16 50 17 60 18 75 19 100 20 120 21 150 22 200 23 300 24 600