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A260011
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Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000101 00010101 or 01010101
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1
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209, 578, 2492, 8450, 25600, 84050, 292422, 985608, 3251280, 10857800, 36602762, 122774450, 410260884, 1373718528, 4607045940, 15437704898, 51696499120, 173176718162, 580275938368, 1944096211250, 6512576848570, 21817926896768
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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) = 2*a(n-1) +9*a(n-3) +27*a(n-4) -13*a(n-5) -a(n-6) -54*a(n-7) -129*a(n-8) +13*a(n-9) -2*a(n-10) +48*a(n-11) +108*a(n-12) -4*a(n-13) -8*a(n-15) -16*a(n-16) for n>17
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EXAMPLE
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Some solutions for n=4
..0..0..0..0..0..0....0..0..1..0..0..0....1..0..1..0..1..0....0..0..0..0..0..0
..0..1..0..1..0..1....0..1..0..1..0..0....0..1..0..1..0..0....0..0..1..0..1..0
..1..0..1..0..1..0....1..0..1..0..1..0....1..0..0..0..1..0....0..1..0..1..0..1
..0..0..0..1..0..0....0..0..0..1..0..1....0..1..0..1..0..1....1..0..1..0..1..0
..1..0..0..0..1..0....1..0..0..0..1..0....1..0..1..0..1..0....0..0..0..1..0..0
..0..1..0..1..0..1....0..1..0..1..0..0....0..0..0..1..0..0....0..0..1..0..1..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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