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A203604
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Number of nX2 0,1 arrays with adjacent row and column sums unequal
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1
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2, 8, 20, 44, 116, 332, 900, 2268, 5716, 14892, 39268, 101820, 260532, 668300, 1727812, 4469404, 11506196, 29540332, 75933220, 195497084, 503093108, 1292802636, 3320226820, 8530094940, 21919963604, 56309625260, 144586811108
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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 4X4
..0..0....1..0....0..0....1..1....1..0....1..1....0..1....1..1....1..0....1..1
..1..0....1..1....1..0....0..0....0..0....0..0....0..0....1..0....1..1....1..0
..0..0....1..0....1..1....0..1....1..0....0..1....0..1....1..1....0..0....1..1
..1..1....1..1....0..0....1..1....0..0....0..0....1..1....1..0....1..0....1..0
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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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