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A184595
1/4 the number of (n+1) X (n+1) binary arrays with equal numbers of 2 X 2 subblocks with sums 1 and 3.
0
2, 24, 1986, 782948, 1291076970, 8783684627835, 245608218357699105, 28056029360014523631654, 13030390694954764597618159782
OFFSET
1,1
COMMENTS
Diagonal of A184604.
EXAMPLE
Some solutions for 3 X 3:
..1..0..0....0..0..1....0..1..1....1..1..1....1..0..0....1..0..0....1..1..1
..1..1..0....1..1..0....1..0..0....1..0..0....1..0..1....1..0..1....0..0..0
..1..0..0....1..1..0....0..1..1....0..1..0....1..1..0....0..1..1....1..1..1
CROSSREFS
Sequence in context: A280922 A296589 A053995 * A369678 A262206 A240993
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 18 2011
STATUS
approved