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

1,1

Comments

Diagonal A183772(2n,2n).

Links

Table of n, a(n) for n=1..5.

Example

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

Crossrefs

Sequence in context: A352022 A262187 A297534 * A358385 A294325 A238821

Adjacent sequences: A183762 A183763 A183764 * A183766 A183767 A183768

Keyword

nonn

Author

R. H. Hardin, Jan 06 2011

Status

approved