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A183812 1/81 the number of (n+1)X(n+1) 0..2 arrays with no 2X2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor 0
1, 162, 163208, 1042063656, 41531687999736, 10425296660739253420 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A183819

LINKS

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

EXAMPLE

Some solutions with upper left block zero for 3X3

..0..0..2....0..0..0....0..0..2....0..0..0....0..0..2....0..0..0....0..0..0

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

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

CROSSREFS

Sequence in context: A291131 A209965 A230837 * A036914 A325063 A214185

Adjacent sequences:  A183809 A183810 A183811 * A183813 A183814 A183815

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 07 2011

STATUS

approved

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Last modified June 17 14:09 EDT 2019. Contains 324185 sequences. (Running on oeis4.)