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A185820 1/5 the number of nX4 0..4 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors 1
5, 656, 49036, 4443292, 378212944, 32995092992, 2852526229300, 247462638659680, 21440004040979204, 1858466937288261508, 161065823451839652032, 13959918564726559991320, 1209903218593886396425592 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 4 of A185825
LINKS
EXAMPLE
Some solutions for 6X4 with a(1,1)=0
..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0
..0..1..1..0....0..1..1..0....0..1..1..0....0..1..1..0....0..1..1..0
..3..0..0..0....3..0..0..0....1..0..0..0....1..0..0..0....0..0..0..0
..3..1..1..2....3..3..2..2....1..2..2..2....1..1..2..2....2..1..2..2
..4..0..0..2....4..3..1..1....1..0..0..2....3..2..2..1....2..1..4..4
..4..2..2..2....4..3..3..3....1..4..4..2....3..3..1..1....3..3..2..2
CROSSREFS
Sequence in context: A203475 A203701 A117709 * A332165 A133750 A203925
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 05 2011
STATUS
approved

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Last modified May 24 21:45 EDT 2024. Contains 372782 sequences. (Running on oeis4.)