A205353 Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having the same number of equal diagonal or antidiagonal elements, and new values 0..2 introduced in row major order.

14, 275, 12866, 1329947, 323378690, 194089073306, 288041668868162, 1037162852168747729

Offset

1,1

Comments

Diagonal of A205361

Links

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

Example

Some solutions for n=4
..0..0..1..0..0....0..1..1..1..1....0..0..1..2..0....0..1..1..2..1
..0..1..2..1..0....1..1..2..1..2....0..1..2..2..2....1..1..0..1..0
..0..0..1..0..2....0..1..1..1..1....0..0..1..2..0....2..1..1..2..1
..1..0..0..2..1....0..0..1..0..1....0..1..1..1..2....0..2..1..1..1
..1..1..0..0..2....0..1..2..1..1....0..0..1..2..2....0..0..2..1..2

Crossrefs

Sequence in context: A001820 A211900 A215544 * A279113 A291099 A053101

Adjacent sequences: A205350 A205351 A205352 * A205354 A205355 A205356

Keyword

nonn

Author

R. H. Hardin, Jan 26 2012

Status

approved