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A223115
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Number of 2Xn 0..2 arrays with exactly floor(2Xn/2) elements equal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order
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1
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0, 4, 28, 124, 832, 6092, 40960, 284702, 1978008, 13815432, 97060752, 684943720, 4843134784, 34353796672, 244220744192, 1739831572888, 12416759857824, 88760284445216, 635404450146240, 4554610943662592, 32686092803274368
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OFFSET
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1,2
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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..0..0....0..1..2....0..1..2....0..1..1....0..1..1....0..1..0....0..1..2
..1..2..1....1..1..2....0..1..1....1..2..0....0..1..0....2..1..1....2..0..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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