A186555 Number of (n+1)X3 0..3 arrays with no 2X2 subblock commuting with any of its horizontal and vertical 2X2 subblock neighbors.

3891, 227890, 13360840, 783375343, 45931015744, 2693039069563, 157898954845170, 9257972050372672, 542815792619425874, 31826514833666294971, 1866060384036495988230, 109411331246371391577832

Offset: 1

Author

R. H. Hardin Feb 23 2011

Keywords

• nonn

Comments

Column 2 of A186558

Examples

			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
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..200