A183366 Number of nX4 binary arrays with no element equal to the sum mod 3 of its horizontal and vertical neighbors

3, 12, 39, 138, 548, 2129, 8311, 32933, 130750, 519980, 2069494, 8238734, 32801506, 130618157, 520176813, 2071605150, 8250287558, 32857555574, 130858980239, 521161959522, 2075594388132, 8266327630092, 32921750282882, 131115278622574

Offset

1,1

Comments

Column 4 of A183368

Links

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

Example

Some solutions for 5X4
..1..0..1..0....1..0..0..0....1..1..0..0....1..1..0..0....1..1..1..0
..0..0..0..1....0..0..1..1....1..1..0..1....1..1..0..1....1..0..1..0
..0..1..0..0....1..0..1..1....0..0..0..0....0..0..0..0....1..1..1..0
..1..0..0..1....0..0..1..1....1..1..1..0....0..1..1..1....0..0..0..0
..0..0..1..0....1..0..0..0....1..1..1..0....0..1..1..1....1..0..0..1

Crossrefs

Sequence in context: A290906 A110153 A343360 * A122994 A271218 A062311

Adjacent sequences: A183363 A183364 A183365 * A183367 A183368 A183369

Keyword

nonn

Author

R. H. Hardin Jan 04 2011

Status

approved