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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
OFFSET
1,1
COMMENTS
Column 5 of A185835
LINKS
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 05 2011
STATUS
approved