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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
OFFSET
1,1
COMMENTS
Diagonal of A186472
LINKS
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 * A371846 A046317 A046374
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 22 2011
STATUS
approved