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A183817 1/81 the number of (n+1)X7 0..2 arrays with no 2X2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor 0
32768, 26630220, 20864057480, 16607782066704, 13143529051807800, 10425296660739253420 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A183819

LINKS

Table of n, a(n) for n=1..6.

EXAMPLE

Some solutions with upper left block zero for 3X7

..0..0..0..0..0..2..1....0..0..0..0..2..0..1....0..0..0..0..2..2..0

..0..0..2..2..1..1..1....0..0..1..1..0..0..1....0..0..2..2..2..2..1

..1..0..1..0..2..1..0....2..0..2..0..1..1..0....1..0..2..0..1..1..0

CROSSREFS

Sequence in context: A017694 A010803 A236223 * A303267 A323545 A017693

Adjacent sequences:  A183814 A183815 A183816 * A183818 A183819 A183820

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 07 2011

STATUS

approved

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Last modified July 16 23:49 EDT 2019. Contains 325092 sequences. (Running on oeis4.)