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A230828
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Number of nX5 0..3 arrays x(i,j) with each element horizontally, vertically or antidiagonally next to at least one element with value (x(i,j)+1) mod 4 and 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, 16, 38, 176, 898, 4350, 22852, 122740, 661598, 3593650, 19572998, 106801924, 583264796, 3186690816, 17414382012, 95176462582, 520213927428, 2843500943294, 15543058517272, 84962392690912, 464431030442718, 2538739709562252
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