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A186453
Number of (n+1)X(n+1) binary arrays with every 2X2 subblock commuting with each of its horizontal and vertical 2X2 subblock neighbors
1
16, 30, 111, 309, 797, 1693, 4121, 9477, 22933, 52197, 122109, 277217, 642629, 1463845, 3375245, 7698781, 17693113, 40404005, 92697797, 211861205, 485587357, 1110399969, 2543583205, 5818446165, 13323806077, 30484799837, 69794079385
OFFSET
1,1
COMMENTS
Diagonal of A186462
LINKS
EXAMPLE
Some solutions for 3X3
..1..1..1....0..0..0....0..0..0....0..0..0....0..1..0....1..0..0....1..0..1
..1..1..1....0..0..0....1..0..0....0..0..0....1..0..1....1..0..0....0..1..0
..1..1..1....1..1..1....0..1..1....0..0..1....0..1..0....1..0..0....1..0..1
CROSSREFS
Sequence in context: A183372 A308026 A145581 * A129617 A221257 A194122
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 22 2011
STATUS
approved