A197438 Number of nX4 0..2 arrays with no element equal to the average of its horizontal and vertical neighbors

28, 1736, 98356, 5184780, 279785830, 15068331840, 811669674888, 43723066740718, 2355282493094894, 126874994917842426, 6834535322256736280, 368164567512212216530, 19832386906421976298012, 1068336297549353928162784

Offset

1,1

Comments

Column 4 of A197442

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

Example

Some solutions for n=5
..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0
..1..1..1..2....1..1..2..1....1..1..1..2....1..1..2..1....1..1..1..2
..0..1..2..0....1..2..1..2....0..0..2..2....0..0..0..0....1..0..0..2
..0..0..0..1....1..0..0..1....1..2..0..1....1..2..1..2....0..2..0..0
..2..2..1..0....0..0..2..2....2..1..1..0....0..2..2..1....2..2..1..0

Crossrefs

Sequence in context: A004705 A182400 A333125 * A263026 A294192 A202811

Adjacent sequences: A197435 A197436 A197437 * A197439 A197440 A197441

Keyword

nonn

Author

R. H. Hardin Oct 15 2011

Status

approved