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A297597
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Number of 4Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 or 5 neighboring 1s.
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1
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1, 20, 69, 154, 752, 3145, 10131, 37929, 150388, 546267, 2000770, 7586016, 28281649, 104554687, 390572927, 1458526512, 5423019339, 20199712660, 75329388620, 280578366045, 1045017557629, 3894288535989, 14509490578040, 54051253212923
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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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FORMULA
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Empirical: a(n) = a(n-1) +3*a(n-2) +24*a(n-3) +23*a(n-4) -17*a(n-5) -95*a(n-6) -73*a(n-7) -45*a(n-8) -36*a(n-9) +4*a(n-10) -4*a(n-11) +2*a(n-12)
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EXAMPLE
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Some solutions for n=7
..0..0..0..1..0..0..0. .0..0..0..0..1..1..0. .1..0..0..0..1..0..1
..0..0..0..0..1..0..0. .0..0..0..0..0..0..0. .0..1..0..0..1..1..1
..0..0..0..0..0..0..1. .0..1..0..0..1..1..0. .0..0..0..0..0..0..1
..0..1..1..0..0..1..0. .1..0..0..0..0..0..0. .0..1..1..0..0..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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