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A281768
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Number of 4Xn 0..1 arrays with no element unequal to a strict majority of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.
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1
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0, 20, 90, 560, 2808, 13968, 68362, 323280, 1529974, 7114300, 32915192, 151142772, 689726508, 3133687480, 14169310798, 63838844556, 286639424578, 1283124275056, 5728711606322, 25513799290264, 113382456085042, 502859346935932
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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=4
..0..0..0..0. .0..1..0..1. .0..0..1..1. .0..0..0..0. .0..0..1..0
..0..1..1..1. .0..0..1..0. .0..1..0..1. .1..1..0..0. .0..1..1..1
..1..1..1..1. .0..0..0..1. .0..0..1..0. .1..1..0..0. .0..0..1..1
..1..1..1..1. .0..0..1..1. .0..0..0..1. .1..1..0..0. .0..0..0..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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