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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. 0
6, 205920, 2323234636800, 7506428481300850827264, 6612015156138094974390271820169216 (list; graph; refs; listen; history; text; internal format)
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: A172864 A262187 A297534 * A294325 A238821 A112642

Adjacent sequences:  A183762 A183763 A183764 * A183766 A183767 A183768

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 06 2011

STATUS

approved

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Last modified October 25 11:16 EDT 2021. Contains 348249 sequences. (Running on oeis4.)