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A183816 1/81 the number of (n+1)X6 0..2 arrays with no 2X2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor 0
4096, 1321860, 414246824, 131467169720, 41531687999736, 13143529051807800, 4156740912572653752 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A183819

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

Some solutions with upper left block zero for 3X6

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

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

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

CROSSREFS

Sequence in context: A224395 A224028 A269206 * A224285 A224208 A017034

Adjacent sequences:  A183813 A183814 A183815 * A183817 A183818 A183819

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 07 2011

STATUS

approved

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Last modified June 17 07:00 EDT 2019. Contains 324183 sequences. (Running on oeis4.)