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A185831 Half the number of nX5 binary arrays with every element equal to exactly one or two of its horizontal and vertical neighbors 1
3, 61, 393, 2398, 15782, 98975, 649826, 4143707, 26679121, 171597547, 1102725806, 7092378045, 45590856963, 293158517847, 1884832244162, 12118696565347, 77918494954731, 500981651046567, 3221109348385647, 20710370917938021 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A185835

LINKS

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

EXAMPLE

Some solutions for 4X5 with a(1,1)=0

..0..0..1..0..0....0..1..1..0..1....0..0..1..1..1....0..1..1..0..0

..1..0..1..0..0....0..0..1..0..1....0..1..1..0..1....0..0..1..0..1

..1..0..1..1..1....1..1..0..0..1....1..0..0..0..1....1..0..0..0..1

..1..0..0..0..1....0..0..0..1..1....1..1..1..1..1....1..1..1..1..1

CROSSREFS

Sequence in context: A181505 A105430 A141979 * A301666 A102720 A120308

Adjacent sequences: A185828 A185829 A185830 * A185832 A185833 A185834

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 05 2011

STATUS

approved

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Last modified December 3 14:49 EST 2022. Contains 358534 sequences. (Running on oeis4.)