# A045681 (b-file synthesized from sequence entry) 0 0 1 1 2 2 3 3 4 4 5 6 6 7 7 8 8 9 9 11 10 12 11 13 12 14 13 16 14 17 15 18 16 19 17 21 18 22 19 23 20 24 21 25 22 26 23 28 24 29 25 30 26 31 27 33 28 34 29 35 30 36 31 38 32 39 33 40 34 41 35 43 36 44 37 45 38 46 39 47 40 48 41 50 42 51 43 52 44 53 45 55 46 56 47 57 48 58 49 60 50 61 51 62 52 63 53 65 54 66 55 67 56 68 57 69 58 70 59 72 60 73