# A004271 (b-file synthesized from sequence entry) 0 0 1 1 2 2 3 3 4 4 5 6 6 8 7 10 8 12 9 14 10 16 11 18 12 20 13 22 14 24 15 26 16 28 17 30 18 32 19 34 20 36 21 38 22 40 23 42 24 44 25 46 26 48 27 50 28 52 29 54 30 56 31 58 32 60 33 62 34 64 35 66 36 68 37 70 38 72 39 74 40 76 41 78 42 80 43 82 44 84 45 86 46 88 47 90 48 92 49 94 50 96 51 98 52 100 53 102 54 104