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A183316
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Number of nX4 binary arrays with an element zero only if there are an even number of ones to its left and an even number of ones above it
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1
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8, 27, 124, 480, 1975, 7833, 31428, 125103, 498825, 1985956, 7906167, 31469417, 125232138, 498389829, 1983161935, 7891800110, 31402125248, 124956937711, 497214816218, 1978508290987, 7872687718931, 31326612697486, 124652113265387
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OFFSET
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1,1
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COMMENTS
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Column 4 of A183322
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LINKS
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R. H. Hardin, Table of n, a(n) for n = 1..200
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FORMULA
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Empirical: a(n)=a(n-1)+23*a(n-2)-10*a(n-3)-180*a(n-4)+34*a(n-5)+630*a(n-6)-63*a(n-7)-1081*a(n-8)+73*a(n-9)+914*a(n-10)-50*a(n-11)-352*a(n-12)+14*a(n-13)+47*a(n-14)+a(n-15)-a(n-16)
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EXAMPLE
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Some solutions for 5X4
..0..1..1..0....0..0..0..0....0..1..1..0....0..0..0..1....0..1..1..1
..0..1..1..0....0..0..0..0....0..1..1..0....0..1..1..1....0..1..1..1
..1..1..0..0....0..1..1..1....0..0..0..0....0..1..1..0....1..1..0..1
..1..1..1..1....0..1..1..1....0..0..0..0....0..0..0..0....1..1..0..1
..0..0..1..1....1..1..1..1....0..0..1..1....0..1..1..0....1..1..1..1
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CROSSREFS
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Sequence in context: A126163 A307117 A331285 * A045971 A176509 A179125
Adjacent sequences: A183313 A183314 A183315 * A183317 A183318 A183319
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin Jan 03 2011
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STATUS
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approved
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