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A185527
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Number of (n+2)X4 binary arrays with each 3X3 subblock nonsingular
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1
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726, 4362, 25854, 150234, 886926, 5221098, 30631134, 180225834, 1059790686, 6228272058, 36622083390, 215312392794, 1265757881262, 7441726142490, 43750907888814, 257212915031082, 1512188713814286, 8890318949201610
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OFFSET
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1,1
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COMMENTS
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Column 2 of A185534
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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)=3*a(n-1)+8*a(n-2)+77*a(n-3)-79*a(n-4)-180*a(n-5)-1228*a(n-6)+48*a(n-7)+232*a(n-8)+4208*a(n-9)-1184*a(n-10)-1664*a(n-11)-6144*a(n-12)
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EXAMPLE
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Some solutions for 6X4
..1..0..0..1....0..0..1..1....0..1..1..0....1..0..0..1....1..0..1..1
..0..0..1..0....1..0..0..1....0..0..1..1....0..0..1..0....0..1..1..0
..0..1..0..1....0..1..0..1....1..0..1..0....0..1..1..0....1..1..0..1
..1..0..0..1....1..1..1..0....1..1..1..1....1..1..0..1....1..0..0..1
..0..1..1..0....1..0..0..1....0..1..1..0....1..0..0..1....0..1..1..1
..0..0..1..0....0..1..0..1....0..1..0..0....0..1..1..1....1..0..1..0
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CROSSREFS
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Sequence in context: A023680 A002769 A216618 * A084412 A090268 A090267
Adjacent sequences: A185524 A185525 A185526 * A185528 A185529 A185530
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin Jan 30 2011
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STATUS
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approved
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