A183765 1/32 the number of (2n+1) X (2n+1) binary arrays with equal numbers of 2 X 2 subblocks with sum mod two being 0 and 1.

6, 205920, 2323234636800, 7506428481300850827264, 6612015156138094974390271820169216

Offset: 1

Author

R. H. Hardin, Jan 06 2011

Keywords

• nonn

Comments

Diagonal A183772(2n,2n).

Examples

			Some solutions for 3 X 3:
..0..0..1....1..1..1....1..1..0....0..0..0....0..0..0....1..0..1....0..0..0
..1..1..0....0..1..1....0..1..1....0..1..0....1..1..0....1..1..0....0..0..0
..1..0..0....1..0..1....0..1..1....1..0..1....1..0..1....1..1..1....0..1..0