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A260972
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Number of (n+2)X(n+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00001001 or 00100101
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0
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48, 133, 372, 1513, 4592, 18706, 45504, 195280, 441072, 2093846, 4057280, 20962048, 38827984, 225849174, 367470344, 2376475916, 3621888816, 26598528246, 37810953848, 300880005340, 400697050360
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OFFSET
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1,1
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COMMENTS
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Diagonal of A260980
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LINKS
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Table of n, a(n) for n=1..21.
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EXAMPLE
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Some solutions for n=4
..0..0..0..1..0..0....0..1..0..0..0..0....1..0..0..0..0..0....1..0..0..0..1..0
..0..0..1..0..0..1....0..0..0..0..0..0....0..1..0..0..0..1....0..0..0..0..0..0
..0..0..0..0..1..0....1..0..0..0..1..0....0..0..0..1..0..0....0..1..0..0..0..0
..0..0..0..0..0..0....0..0..1..0..0..1....0..0..1..0..0..0....1..0..0..1..0..0
..0..1..0..0..0..0....1..0..0..1..0..0....0..0..0..0..1..0....0..0..1..0..0..0
..1..0..0..1..0..0....0..1..0..0..0..1....0..0..0..1..0..0....1..0..0..0..1..0
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CROSSREFS
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Cf. A260980
Sequence in context: A295428 A118145 A260833 * A244380 A260493 A003502
Adjacent sequences: A260969 A260970 A260971 * A260973 A260974 A260975
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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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