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

8, 329, 45056, 19934369, 28864215128, 137884925726873, 2183735443548857744, 115025778364437876962225, 20195410108776255562409533352, 11837286998861556208797264551862761

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