A183816 1/81 the number of (n+1)X6 0..2 arrays with no 2X2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor

4096, 1321860, 414246824, 131467169720, 41531687999736, 13143529051807800, 4156740912572653752

Offset

1,1

Comments

Column 5 of A183819

Links

Table of n, a(n) for n=1..7.

Example

Some solutions with upper left block zero for 3X6
..0..0..0..0..1..2....0..0..0..0..1..2....0..0..0..0..0..2....0..0..0..0..2..0
..0..0..1..1..1..2....0..0..1..2..2..0....0..0..1..2..2..0....0..0..2..1..1..0
..0..1..2..2..1..0....1..2..1..0..2..1....2..1..1..1..2..0....1..1..2..0..1..2

Crossrefs

Sequence in context: A224395 A224028 A269206 * A224285 A224208 A017034

Adjacent sequences: A183813 A183814 A183815 * A183817 A183818 A183819

Keyword

nonn

Author

R. H. Hardin Jan 07 2011

Status

approved