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A207129
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Number of nX3 0..3 arrays avoiding the pattern z z+1 z in any row or column
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1
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61, 3721, 197144, 10372917, 546965177, 28848306206, 1521486186616, 80244105724945, 4232124574042091, 223204941516339823, 11771970446658242928, 620861199183478906328, 32744614050424872414063, 1726971746484789854841910
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