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A202043
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Number of zero-sum nX4 -1..1 arrays with every element unequal to at most two horizontal and vertical neighbors
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1
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19, 335, 2921, 31753, 359017, 4188917, 49553277, 594443301, 7206865523, 88120417529, 1084547246367, 13417760493253, 166705101517923, 2078489858665207, 25992085202674059, 325869090446388117
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