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A204069 Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..2 introduced in row major order 0
8, 329, 45056, 19934369, 28864215128, 137884925726873, 2183735443548857744, 115025778364437876962225, 20195410108776255562409533352, 11837286998861556208797264551862761 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A204076

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A264053 A300613 A221407 * A226551 A285370 A247730

Adjacent sequences:  A204066 A204067 A204068 * A204070 A204071 A204072

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 10 2012

STATUS

approved

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Last modified July 27 15:49 EDT 2021. Contains 346308 sequences. (Running on oeis4.)