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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A186462

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..39

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

Adjacent sequences:  A186450 A186451 A186452 * A186454 A186455 A186456

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 22 2011

STATUS

approved

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Last modified August 16 14:26 EDT 2022. Contains 356168 sequences. (Running on oeis4.)