A205218 Number of (n+1) X (n+1) 0..1 arrays with the number of equal 2 X 2 subblock diagonal pairs and equal antidiagonal pairs differing from each horizontal or vertical neighbor, and new values 0..1 introduced in row major order.

8, 52, 328, 2144, 14220, 104404, 811604, 7103748, 67274976, 713213320, 8295727284, 106973119052, 1531000108588

Offset

1,1

Comments

Diagonal of A205226.

Links

Table of n, a(n) for n=1..13.

Example

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

Crossrefs

Sequence in context: A111996 A016129 A006631 * A287813 A126503 A155590

Adjacent sequences: A205215 A205216 A205217 * A205219 A205220 A205221

Keyword

nonn

Author

R. H. Hardin, Jan 23 2012

Status

approved