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A230830
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Number of nX7 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, 124, 456, 3034, 22852, 201592, 1807682, 16202418, 145774974, 1316654208, 11925318054, 108181945306, 982423923962, 8927514669564, 81157461251264, 737931539839332, 6710435168666098, 61025322017165952, 554987343000961892
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