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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
OFFSET
1,1
COMMENTS
Column 4 of A223012
LINKS
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 11 2013
STATUS
approved