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A231062
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Number of nX7 0..3 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 4, no adjacent elements equal, and upper left element zero
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1
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0, 778, 47998, 3607664, 270096962, 20286249268, 1524513500124, 114623595936566, 8620079317973610, 648336326622533098, 48765953333817735404, 3668154457146990333796, 275921956841908575609620
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