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A186555
Number of (n+1)X3 0..3 arrays with no 2X2 subblock commuting with any of its horizontal and vertical 2X2 subblock neighbors
4
3891, 227890, 13360840, 783375343, 45931015744, 2693039069563, 157898954845170, 9257972050372672, 542815792619425874, 31826514833666294971, 1866060384036495988230, 109411331246371391577832
OFFSET
1,1
COMMENTS
Column 2 of A186558
LINKS
EXAMPLE
Some solutions for 5X3
..2..2..0....2..2..0....2..2..0....2..2..0....2..2..0....0..2..0....0..2..0
..0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0
..1..2..1....1..2..2....0..2..1....1..2..3....2..2..3....1..2..1....3..2..0
..2..0..1....2..2..2....3..1..3....2..3..2....2..0..1....3..3..0....3..3..3
..0..3..2....1..2..3....1..0..1....3..2..2....3..3..0....2..2..0....0..2..1
CROSSREFS
Sequence in context: A223597 A223438 A223690 * A185862 A242863 A247691
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 23 2011
STATUS
approved