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A210327 1/4 the number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having two or three distinct clockwise edge differences 0
39, 11877, 27838382, 517186072378, 75219268772459800, 85910577682285107137239, 769246866811235591580558612197, 54025101820467333958086011203622611205 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A210335

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=4

..0..0..1..1..1....2..1..0..1..2....2..0..0..1..0....3..0..2..0..3

..3..3..2..2..0....1..0..0..1..3....2..2..0..1..0....0..3..1..3..3

..0..3..1..1..3....0..0..1..1..1....2..0..0..0..0....1..2..1..2..1

..1..2..1..2..0....0..3..2..3..3....1..0..1..0..3....1..0..3..2..2

..2..3..2..1..1....3..3..1..3..1....0..0..0..0..0....1..2..1..1..3

CROSSREFS

Sequence in context: A266453 A279116 A266307 * A174765 A115462 A268072

Adjacent sequences:  A210324 A210325 A210326 * A210328 A210329 A210330

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 20 2012

STATUS

approved

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Last modified September 20 03:55 EDT 2019. Contains 327212 sequences. (Running on oeis4.)