A223008 Number of nX4 0..1 arrays with no more than floor(nX4/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..1 order

4, 18, 117, 840, 6240, 47139, 360347, 2779528, 21588898, 168613534, 1322868729, 10417760419, 82302522544, 651981307285, 5177047812119, 41193230296706, 328367767613750, 2621791862367316, 20963552382355484, 167840827307586780

Offset

1,1

Comments

Column 4 of A223012

Links

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

Example

Some solutions for n=3
..0..0..1..0....0..0..0..0....0..0..1..1....0..0..0..0....0..0..0..0
..1..1..1..1....0..0..0..0....0..1..1..1....0..0..0..1....0..0..0..0
..1..1..1..1....1..1..0..1....1..1..1..0....1..1..1..1....0..1..0..0

Crossrefs

Sequence in context: A326261 A277473 A278994 * A162224 A321704 A296982

Adjacent sequences: A223005 A223006 A223007 * A223009 A223010 A223011

Keyword

nonn

Author

R. H. Hardin Mar 11 2013

Status

approved