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A186483 Number of (n+1)X(n+1) 0..4 arrays with every 2X2 subblock commuting with each of its horizontal and vertical 2X2 subblock neighbors 0
625, 839, 17015, 64680, 575344, 1759744, 15145144, 52024944, 422063944, 1535037344, 11681382744, 44716060144, 324000643944, 1297964842944, 9013961908344, 37548525033744, 251396274363144, 1083126105726944 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A186484

LINKS

Table of n, a(n) for n=1..18.

EXAMPLE

Some solutions for 3X3

..1..2..1....3..0..2....4..0..0....3..3..0....4..1..0....1..4..0....1..1..0

..2..1..2....0..3..0....4..0..0....4..0..3....0..0..1....2..0..4....3..0..1

..1..2..1....0..0..3....0..4..4....0..4..4....0..0..3....0..2..0....0..3..4

CROSSREFS

Sequence in context: A210115 A186484 A184037 * A043352 A223183 A171995

Adjacent sequences:  A186480 A186481 A186482 * A186484 A186485 A186486

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 22 2011

STATUS

approved

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Last modified June 22 03:25 EDT 2021. Contains 345367 sequences. (Running on oeis4.)