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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
OFFSET
1,1
COMMENTS
Diagonal A183772(2n,2n).
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 06 2011
STATUS
approved