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A260975
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Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00001001 or 00100101
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1
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204, 239, 372, 732, 1288, 2576, 4688, 8760, 15964, 30062, 55496, 105078, 192148, 361876, 663360, 1248880, 2301984, 4312846, 7974836, 14889918, 27581092, 51446550, 95444100, 177936588, 330029564, 614889132, 1141497232, 2126263226
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OFFSET
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1,1
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COMMENTS
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Column 3 of A260980
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LINKS
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R. H. Hardin, Table of n, a(n) for n = 1..210
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FORMULA
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Empirical: a(n) = 8*a(n-4) +6*a(n-5) +10*a(n-7) +5*a(n-8) -24*a(n-9) -4*a(n-10) -26*a(n-11) +39*a(n-12) -a(n-14) for n>18
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EXAMPLE
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Some solutions for n=4
..0..1..0..0..1....1..0..0..1..0....0..0..0..1..0....0..1..0..0..1
..0..0..1..0..0....0..0..1..0..0....0..0..0..0..0....0..0..1..0..0
..1..0..0..0..0....1..0..0..0..1....1..0..0..0..0....1..0..0..0..1
..0..1..0..0..0....0..1..0..0..0....0..0..0..1..0....0..0..0..1..0
..0..0..0..1..0....0..0..0..0..0....0..1..0..0..1....0..1..0..0..0
..1..0..0..0..1....0..0..0..0..1....0..0..1..0..0....0..0..1..0..1
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CROSSREFS
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Cf. A260980
Sequence in context: A198913 A224983 A138605 * A271643 A108877 A163393
Adjacent sequences: A260972 A260973 A260974 * A260976 A260977 A260978
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin, Aug 06 2015
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STATUS
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approved
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