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A299724
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Number of nX4 0..1 arrays with every element equal to 1, 2, 3, 4, 5, 6 or 7 king-move adjacent elements, with upper left element zero.
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1
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2, 64, 1027, 14701, 217069, 3224826, 47845523, 709688988, 10527287354, 156159875103, 2316442953649, 34361615605499, 509712837363886, 7560971064491745, 112157825145811942, 1663725151784378554
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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Empirical: a(n) = 12*a(n-1) +31*a(n-2) +137*a(n-3) +377*a(n-4) +288*a(n-5) -24*a(n-6) -577*a(n-7) -1562*a(n-8) -984*a(n-9) +390*a(n-10) +450*a(n-11) +222*a(n-12) -4*a(n-13) -131*a(n-14) -10*a(n-15) +24*a(n-16) for n>17
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EXAMPLE
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Some solutions for n=5
..0..0..0..0. .0..0..1..0. .0..0..1..0. .0..0..1..0. .0..0..1..0
..1..0..0..0. .0..1..0..0. .0..1..0..0. .1..0..0..1. .1..1..1..0
..1..0..1..1. .0..0..1..1. .0..0..0..0. .1..1..1..0. .1..1..0..1
..0..1..1..0. .0..0..0..1. .1..0..1..1. .0..1..1..0. .1..0..1..1
..1..0..0..1. .0..0..0..0. .0..1..1..1. .0..1..1..1. .0..1..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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