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A251342
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Number of (n+1)X(7+1) 0..3 arrays with every 2X2 subblock summing to a nonzero multiple of 3
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1
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2190625, 99776859, 6775415354, 687109914883, 91970680872031, 14450351430729220, 2476540453681100993, 444899690539687485323, 81997849049595954137818, 15325729998270029389138691
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