A183499 Half the number of nX7 0..2 arrays with no element equal to the sum mod 3 of its horizontal and vertical neighbors

64, 8256, 1048576, 134226432, 17180393472, 2199023255552

Offset

1,1

Comments

Column 7 of A183501

Links

Table of n, a(n) for n=1..6.

Example

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

Crossrefs

Sequence in context: A303426 A317516 A300181 * A187702 A184764 A239647

Adjacent sequences: A183496 A183497 A183498 * A183500 A183501 A183502

Keyword

nonn

Author

R. H. Hardin Jan 05 2011

Status

approved