(Translated by https://www.hiragana.jp/)
# b015777.txt - Table of n, a(n) for n=0..2000 - Ray Chandler, Apr 05 2017 0 1 1 0 2 0 3 0 4 -1 5 0 6 0 7 0 8 1 9 0 10 0 11 0 12 -1 13 0 14 0 15 0 16 1 17 0 18 0 19 0 20 -1 21 0 22 0 23 0 24 1 25 0 26 0 27 0 28 -1 29 0 30 0 31 0 32 1 33 0 34 0 35 0 36 -1 37 0 38 0 39 0 40 1 41 0 42 0 43 0 44 -1 45 0 46 0 47 0 48 1 49 0 50 0 51 0 52 0 53 0 54 0 55 0 56 0 57 0 58 0 59 0 60 0 61 0 62 0 63 0 64 0 65 0 66 0 67 0 68 1 69 0 70 0 71 0 72 -1 73 0 74 0 75 0 76 1 77 0 78 0 79 0 80 -1 81 0 82 0 83 0 84 1 85 0 86 0 87 0 88 -1 89 0 90 0 91 0 92 1 93 0 94 0 95 0 96 -1 97 0 98 0 99 0 100 1 101 0 102 0 103 0 104 -1 105 0 106 0 107 0 108 1 109 0 110 0 111 0 112 -1 113 0 114 0 115 0 116 1 117 0 118 0 119 0 120 0 121 0 122 0 123 0 124 0 125 0 126 0 127 0 128 0 129 0 130 0 131 0 132 0 133 0 134 0 135 0 136 0 137 0 138 0 139 0 140 0 141 0 142 0 143 0 144 0 145 0 146 0 147 0 148 0 149 0 150 0 151 0 152 0 153 0 154 0 155 0 156 0 157 0 158 0 159 0 160 0 161 0 162 0 163 0 164 0 165 0 166 0 167 0 168 0 169 0 170 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