# A006075 (b-file synthesized from sequence entry) 1 1 2 4 3 4 4 4 5 5 6 8 7 10 8 12 9 14 10 16 11 21 12 24 13 28 14 32 15 36 16 40 17 46 18 52 19 57 20 62 21 68