# A084520 (b-file synthesized from sequence entry) 0 0 1 1 2 2 3 2 4 3 5 3 6 3 7 4 8 4 9 4 10 5 11 5 12 5 13 6 14 6 15 6 16 6 17 7 18 7 19 7 20 7 21 8 22 8 23 8 24 8 25 9 26 9 27 9 28 9 29 10 30 10 31 10 32 10 33 11 34 11 35 11 36 11 37 12 38 12 39 12 40 12 41 13 42 13 43 13 44 13 45 14 46 14 47 14 48 14 49 15 50 15 51 15 52 15 53 16 54 16 55 16 56 16 57 17 58 17 59 17 60 17 61 18 62 18 63 18 64 18 65 18 66 19 67 19 68 19 69 19 70 19 71 20 72 20 73 20 74 20 75 20 76 21 77 21 78 21