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A227332 Number of n X 5 0,1 arrays indicating 2 X 2 subblocks of some larger (n+1) X 6 binary array having two adjacent 1's and two adjacent 0's, with rows and columns of the latter in lexicographically nondecreasing order. 1
26, 285, 3013, 33297, 366606, 3774137, 35026386, 290742258, 2174611745, 14827903973, 93194118189, 544831575434, 2984722060733, 15415176834304, 75441255758231, 351377507165460, 1563422116701546, 6667161613820532 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 5 of A227333.
LINKS
EXAMPLE
Some solutions for n=4
..0..0..0..0..0....0..0..0..1..1....0..1..0..0..0....0..0..0..0..1
..0..0..0..0..0....0..0..1..0..0....1..0..1..1..0....0..1..0..0..0
..1..1..0..1..0....0..0..0..1..0....1..0..0..0..0....0..0..0..1..1
..1..0..0..1..0....1..1..0..0..1....1..0..0..0..0....0..0..0..1..1
CROSSREFS
Sequence in context: A200555 A130901 A336732 * A020925 A224331 A125414
KEYWORD
nonn
AUTHOR
R. H. Hardin Jul 07 2013
STATUS
approved

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Last modified April 15 18:10 EDT 2024. Contains 371694 sequences. (Running on oeis4.)