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A186463 Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock commuting with each of its horizontal and vertical 2X2 subblock neighbors 1
81, 129, 942, 3186, 13278, 34314, 136086, 399018, 1537038, 4607034, 16888062, 51777498, 185254926, 580089834, 2037893214, 6478793466, 22450788942, 72203998026, 247694103486, 803564559834, 2735884703406, 8933648141802 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A186472

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..23

EXAMPLE

Some solutions for 3X3

..0..0..2....1..0..0....0..0..1....0..2..0....1..1..0....1..2..0....0..0..0

..0..0..2....2..0..0....0..0..1....2..0..2....2..0..1....0..0..2....2..0..0

..0..0..2....0..2..1....0..0..1....0..2..2....0..2..2....0..0..1....0..2..1

CROSSREFS

Sequence in context: A053887 A119943 A001245 * A046317 A046374 A153259

Adjacent sequences:  A186460 A186461 A186462 * A186464 A186465 A186466

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 22 2011

STATUS

approved

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Last modified November 29 03:09 EST 2014. Contains 250479 sequences.