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A185901
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1/8 the number of nX4 0..7 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors
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0
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8, 2765, 546280, 139230658, 32611077940, 7921723799549, 1897334511466261, 457135757368429048, 109875454057222039886, 26435697398605508731039, 6357732815393016703934708, 1529282331683348275213637905
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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for 3X4 with a(1,1)=0
..0..4..4..3....0..0..6..6....0..4..1..0....0..0..4..5....0..0..5..4
..0..0..1..3....2..0..3..3....0..4..1..0....4..0..4..5....0..6..5..4
..6..6..1..1....2..2..2..3....7..7..2..2....4..0..3..3....0..6..3..3
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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