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A261284
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Number of (n+2)X(n+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00010101 or 01010101.
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1
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36, 77, 271, 1147, 6996, 51268, 561724, 6295926, 107865659, 2065840014, 57883274521, 1752577624054, 80161163488540, 3993898268151118, 295206710031036849, 23800415351857927140, 2870471520849798820514
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OFFSET
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1,1
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COMMENTS
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Diagonal of A261292.
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LINKS
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R. H. Hardin, Table of n, a(n) for n = 1..22
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EXAMPLE
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Some solutions for n=4
..1..0..0..0..1..0....1..0..1..0..1..0....0..0..0..0..1..0....1..0..1..0..1..0
..0..1..0..1..0..1....0..1..0..1..0..1....0..0..0..0..0..1....0..1..0..1..0..1
..1..0..1..0..1..0....1..0..0..0..1..0....0..0..1..0..1..0....1..0..1..0..1..0
..0..1..0..1..0..1....0..1..0..1..0..0....0..0..0..1..0..1....0..1..0..1..0..1
..1..0..1..0..1..0....1..0..1..0..1..0....1..0..1..0..1..0....1..0..1..0..1..0
..0..1..0..1..0..1....0..1..0..0..0..0....0..1..0..1..0..1....0..1..0..0..0..1
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CROSSREFS
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Cf. A261292.
Sequence in context: A262796 A255101 A255094 * A111163 A286430 A279901
Adjacent sequences: A261281 A261282 A261283 * A261285 A261286 A261287
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin, Aug 14 2015
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STATUS
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approved
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