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A277657
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Number of nX6 0..2 arrays with every element equal to some element at offset (-1,0) (-1,1) (0,-1) (0,1) or (1,0) both plus 1 mod 3 and minus 1 mod 3, with new values introduced in order 0..2.
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1
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0, 28, 2928, 376200, 41272404, 4770227060, 541407069559, 61782920451544, 7039498755007500, 802512669942654611, 91471885881045836163, 10426700328596033389040, 1188501290406035357519416
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