# A003977 (b-file synthesized from sequence entry) 1 1 2 2 3 3 4 3 5 4 6 6 7 5 8 4 9 7 10 8 11 6 12 9 13 7 14 10 15 12 16 5 17 8 18 14 19 9 20 12 21 15 22 12 23 10 24 12 25 13 26 14 27 15 28 15 29 11 30 24 31 12 32 6 33 18 34 16 35 20 36 21 37 13 38 18 39 21 40 16 41 14 42 30 43 15 44 18 45 28 46 20 47 16 48 15 49 21 50 26 51 24 52 21 53 17 54 30 55 24 56 20 57 27 58 22 59 18 60 36 61 19 62 24 63 35 64 7 65 28 66 36 67 20 68 24 69 30 70 40 71 21 72 28 73 22 74 26