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

1,1

Comments

Column 2 of A186558

Links

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

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

Adjacent sequences: A186552 A186553 A186554 * A186556 A186557 A186558

Keyword

nonn

Author

R. H. Hardin Feb 23 2011

Status

approved