A187439 Number of (n+1)X8 0..2 arrays with no 2X2 subblock commuting with any of its horizontal and vertical 2X2 subblock neighbors

24995294, 73023484028, 215547981233289, 638715674028172903, 1890619227290921101120

Offset

1,1

Comments

Column 7 of A187441

Links

Table of n, a(n) for n=1..5.

Example

Some solutions for 3X8
..0..0..0..0..2..1..2..1....0..0..0..0..2..2..2..2....0..0..0..0..1..2..2..2
..0..1..0..1..0..0..2..0....0..1..0..1..1..2..1..0....0..1..0..1..0..0..0..2
..0..0..0..0..2..1..0..1....0..0..0..0..0..2..2..2....0..0..0..0..2..0..2..2

Crossrefs

Sequence in context: A257383 A186839 A206084 * A175580 A204778 A172795

Adjacent sequences: A187436 A187437 A187438 * A187440 A187441 A187442

Keyword

nonn

Author

R. H. Hardin Mar 10 2011

Status

approved