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A210069 1/4 the number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having one or three distinct clockwise edge differences 0
33, 7653, 11333893, 114628150378, 7804233177145593, 3585439186083048636774, 11099179467499737412764448230, 231524919565338418309736640383814198 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A210077

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A183551 A114071 A330134 * A316777 A057981 A219563

Adjacent sequences:  A210066 A210067 A210068 * A210070 A210071 A210072

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 17 2012

STATUS

approved

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Last modified July 24 01:41 EDT 2021. Contains 346269 sequences. (Running on oeis4.)