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A260280
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Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000000 00000001 or 00001011
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1
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202, 525, 2027, 6044, 18380, 60955, 192277, 595506, 1903722, 6052530, 19003962, 60149738, 190824807, 602506945, 1904270753, 6029330442, 19066139003, 60275105360, 190686505791, 603143941550, 1907284297095, 6032465100205
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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) = a(n-1) +24*a(n-3) +6*a(n-4) +6*a(n-5) -134*a(n-6) -100*a(n-7) -15*a(n-8) +357*a(n-9) +227*a(n-10) +71*a(n-11) -416*a(n-12) -300*a(n-13) -66*a(n-14) +222*a(n-15) +159*a(n-16) +41*a(n-17) -61*a(n-18) -31*a(n-19) +6*a(n-21) for n>26
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EXAMPLE
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Some solutions for n=4
..1..0..0..0..0..1....0..0..0..0..1..0....1..0..0..0..1..1....0..0..1..0..1..0
..0..1..0..0..0..0....0..0..0..0..0..0....0..0..0..1..0..0....0..0..0..0..1..0
..0..0..0..0..0..0....1..0..0..0..0..0....0..0..0..0..0..0....0..0..0..0..0..0
..0..0..0..0..0..0....0..0..0..0..0..1....0..0..0..0..0..0....0..0..0..0..0..0
..0..1..0..0..1..0....0..0..0..0..0..0....0..1..0..0..0..0....0..0..1..0..0..0
..0..0..0..0..0..1....0..0..0..0..1..1....0..0..0..0..0..0....0..0..0..0..0..1
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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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