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A209532
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Half the number of (n+1)X7 0..2 arrays with every 2X2 subblock having exactly two distinct clockwise edge differences
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1
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129, 1537, 16385, 196609, 2097153, 25165825, 268435457, 3221225473, 34359738369, 412316860417, 4398046511105, 52776558133249, 562949953421313, 6755399441055745, 72057594037927937, 864691128455135233
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OFFSET
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1,1
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COMMENTS
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Column 6 of A209534
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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) = a(n-1) +128*a(n-2) -128*a(n-3)
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EXAMPLE
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Some solutions for n=4
..0..1..2..1..2..1..2....0..1..2..1..2..1..0....1..2..1..2..1..2..1
..1..2..1..2..1..2..1....1..0..1..0..1..0..1....2..1..0..1..2..1..2
..0..1..0..1..0..1..0....2..1..2..1..0..1..2....1..2..1..0..1..2..1
..1..2..1..2..1..2..1....1..0..1..2..1..0..1....0..1..2..1..2..1..0
..2..1..2..1..0..1..2....0..1..0..1..2..1..0....1..0..1..0..1..2..1
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CROSSREFS
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Sequence in context: A043383 A036548 A046286 * A088719 A034681 A017677
Adjacent sequences: A209529 A209530 A209531 * A209533 A209534 A209535
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin Mar 10 2012
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STATUS
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approved
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