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A231061
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Number of nX6 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, 230, 7818, 313944, 12582344, 505135612, 20286249268, 814871303100, 32735101347962, 1315094209121840, 52833398277964844, 2122581619644690616, 85275101975137588046, 3425950358334849580350, 137638633914499167727240
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