A197104 Half the number of nX3 0..3 arrays with no element equal to the average of its horizontal and vertical neighbors

16, 1015, 50831, 2548972, 127561432, 6385146382, 319626874708, 15999836095846, 800916441358294, 40092114594159126, 2006923132890272745, 100462160201819897870, 5028914884473383292290, 251736423646820731452182

Offset

1,1

Comments

Column 3 of A197109

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

Some solutions for 4X4
..1..0..0....1..0..0....0..0..0....1..0..0....1..0..0....1..0..0....1..0..0
..0..2..2....1..2..2....3..2..1....0..2..3....0..0..3....0..0..3....1..1..3
..3..3..3....3..1..3....0..1..3....2..2..2....2..1..1....1..0..2....0..2..0
..2..3..1....0..2..0....2..2..1....2..3..3....0..2..3....0..2..0....3..0..2

Crossrefs

Sequence in context: A160012 A070307 A159683 * A358051 A067490 A130036

Adjacent sequences: A197101 A197102 A197103 * A197105 A197106 A197107

Keyword

nonn

Author

R. H. Hardin Oct 10 2011

Status

approved