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A222669
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Number of nX4 0..2 arrays with exactly floor(nX4/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..2 order
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1
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3, 9, 40, 348, 2370, 20606, 212842, 2134959, 21085549, 211716164, 2136631932, 21522095442, 217024139551, 2193065402495, 22187387560680, 224679112979344, 2277631748750522, 23112487299379689, 234748284433308243
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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 n=3
..0..1..0..0....0..0..0..0....0..1..1..1....0..0..0..0....0..1..1..1
..1..0..0..0....1..0..0..0....1..1..1..1....0..0..0..0....1..1..1..1
..0..0..0..0....2..0..0..0....1..1..1..2....1..1..0..0....0..1..1..1
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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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