A187438 Number of (n+1)X7 0..2 arrays with no 2X2 subblock commuting with any of its horizontal and vertical 2X2 subblock neighbors

3022484, 3319295436, 3677337022406, 4086873166309438, 4538075433355553643

Offset

1,1

Comments

Column 6 of A187441

Links

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

Example

Some solutions for 3X7
..0..0..0..0..0..1..0....0..0..0..1..1..0..1....0..0..0..0..1..2..2
..0..1..0..1..2..2..0....0..1..0..1..1..0..2....0..1..0..1..2..1..0
..0..0..0..2..1..1..0....0..0..0..0..2..2..0....0..0..0..2..2..0..0

Crossrefs

Sequence in context: A224077 A114065 A268405 * A184374 A205932 A281447

Adjacent sequences: A187435 A187436 A187437 * A187439 A187440 A187441

Keyword

nonn

Author

R. H. Hardin Mar 10 2011

Status

approved