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A185792
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Number of (n+1)X4 binary arrays with no 2X2 subblock sum equal to any horizontal or vertical neighbor 2X2 subblock sum
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1
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100, 224, 510, 1336, 3196, 7888, 18616, 47776, 114688, 287552, 688224, 1748816, 4222224, 10624992, 25631024, 64747856, 157124640, 395097680, 958057168, 2410200224, 5872575888, 14735969680, 35868054112, 89946082128, 219845635408
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OFFSET
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1,1
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COMMENTS
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Column 3 of A185798
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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-3)+64*a(n-4)+2*a(n-5)-40*a(n-7)-1262*a(n-8)-16*a(n-9)+4*a(n-10)+512*a(n-11)+8528*a(n-12)-128*a(n-13)-2048*a(n-15)-10240*a(n-16)+4096*a(n-20) for n>21
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EXAMPLE
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Some solutions for 3X4
..0..1..1..1....1..1..0..0....1..1..1..1....1..1..1..1....0..0..0..0
..0..1..0..0....1..1..0..1....1..1..0..0....0..0..1..1....0..1..1..0
..1..1..0..1....0..0..0..1....1..0..1..0....0..1..0..1....1..1..1..1
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CROSSREFS
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Sequence in context: A249702 A188245 A122467 * A027604 A116145 A248550
Adjacent sequences: A185789 A185790 A185791 * A185793 A185794 A185795
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin Feb 04 2011
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STATUS
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approved
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