A183506 Number of nX4 0..3 arrays with no element equal to the sum mod 4 of its horizontal and vertical neighbors

81, 6561, 531441, 43146816, 3486784401, 282429536481, 22876792454961, 1853020188851841, 150094687634051328, 12157665459056928801, 984770902183611232881, 79766443076872509863361, 6461081889226673298932241

Offset

1,1

Comments

Column 4 of A183508

Links

R. H. Hardin, Table of n, a(n) for n = 1..15

Example

Some solutions for 3X4
..2..2..0..3....0..2..3..3....2..0..2..0....2..2..1..1....2..2..0..1
..3..1..0..2....1..0..0..1....1..3..1..0....1..0..3..1....1..1..2..2
..1..1..2..2....2..2..3..3....2..2..2..0....0..0..3..3....3..1..2..2

Crossrefs

Sequence in context: A188872 A217997 A089683 * A099372 A036515 A223553

Adjacent sequences: A183503 A183504 A183505 * A183507 A183508 A183509

Keyword

nonn

Author

R. H. Hardin Jan 05 2011

Status

approved