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A183623
Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock summing to 4
0
19, 87, 355, 1383, 5299, 20247, 77635, 299463, 1162579, 4540407
OFFSET
1,1
COMMENTS
Diagonal of A183632
EXAMPLE
Some solutions for 3X3
..1..2..0....0..2..0....1..2..0....2..0..1....1..1..0....0..1..0....0..1..1
..0..1..1....2..0..2....1..0..2....0..2..1....0..2..1....1..2..1....2..1..1
..2..1..1....1..1..1....2..1..1....2..0..1....1..1..0....0..1..0....1..0..2
CROSSREFS
Sequence in context: A039609 A063496 A027848 * A039454 A142089 A174819
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 06 2011
STATUS
approved