# A003815 (b-file synthesized from sequence entry) 0 0 1 1 2 3 3 0 4 4 5 1 6 7 7 0 8 8 9 1 10 11 11 0 12 12 13 1 14 15 15 0 16 16 17 1 18 19 19 0 20 20 21 1 22 23 23 0 24 24 25 1 26 27 27 0 28 28 29 1 30 31 31 0 32 32 33 1 34 35 35 0 36 36 37 1 38 39 39 0 40 40 41 1 42 43 43 0 44 44 45 1 46 47 47 0 48 48 49 1 50 51 51 0 52 52 53 1 54 55 55 0 56 56 57 1 58 59 59 0 60 60 61 1 62 63 63 0 64 64 65 1 66 67 67 0