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A183705
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Number of (n+1)X5 0..3 arrays with every 2X2 subblock nonsingular
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1
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409128, 208772880, 106093597920, 53961750797424, 27440831422595136, 13954952466340976784, 7096672408605671392416, 3608961753073209868200240, 1835310417510901571397984768, 933333481699094358785391223248
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OFFSET
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1,1
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COMMENTS
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Column 4 of A183710
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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)=280*a(n-1)+112580*a(n-2)+3492162*a(n-3)-819288385*a(n-4)-12793008650*a(n-5)+2892208505752*a(n-6)-40764002087564*a(n-7)-3347388386802251*a(n-8)+143992036050120492*a(n-9)-2105303984131021756*a(n-10)+4800567008428590850*a(n-11)+182742851553762560045*a(n-12)-1364110029736402568010*a(n-13)-5200934207479738964528*a(n-14)+61142874543395383890792*a(n-15)+100553502890870219473632*a(n-16)-1032217400773371826650672*a(n-17)-2029259347165494259181424*a(n-18)+2743207961236529270609952*a(n-19)+5097128258414084374606464*a(n-20)-1701928181673046183177728*a(n-21)-410351258133601815379968*a(n-22)
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EXAMPLE
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Some solutions for 3X5
..0..2..0..2..1....0..2..0..2..0....0..2..0..2..3....0..2..0..2..3
..2..0..3..0..1....2..0..2..1..1....2..0..3..1..3....2..0..3..1..1
..3..2..1..3..1....2..3..2..3..2....1..1..1..3..1....3..2..3..0..1
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CROSSREFS
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Sequence in context: A210265 A043609 A220988 * A182116 A078519 A187171
Adjacent sequences: A183702 A183703 A183704 * A183706 A183707 A183708
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin Jan 06 2011
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STATUS
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approved
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