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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 1
4, 18, 117, 840, 6240, 47139, 360347, 2779528, 21588898, 168613534, 1322868729, 10417760419, 82302522544, 651981307285, 5177047812119, 41193230296706, 328367767613750, 2621791862367316, 20963552382355484, 167840827307586780 (list; graph; refs; listen; history; text; internal format)
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

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Last modified September 22 22:38 EDT 2021. Contains 347609 sequences. (Running on oeis4.)