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A205602 Number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having the same number of equal edges as its horizontal neighbors and a different number from its vertical neighbors, and new values 0..3 introduced in row major order 0
15, 1030, 229445, 146904738, 219511132715, 1046956456530150 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A205609

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A082158 A064625 A241331 * A233509 A206162 A203409

Adjacent sequences:  A205599 A205600 A205601 * A205603 A205604 A205605

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 29 2012

STATUS

approved

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Last modified September 19 06:16 EDT 2020. Contains 337177 sequences. (Running on oeis4.)