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A265452
Number of nX2 0..n+2-2 arrays with each element differing from its horizontal and vertical neighbors by one or two.
1
2, 18, 250, 3358, 42282, 502154, 5710302, 62782966, 672520310, 7056533978, 72819524370, 741279145398, 7460955607878, 74381377429158, 735539563061590, 7222916531541006, 70499118369836786, 684459097597365542
OFFSET
1,1
COMMENTS
Column 2 of A265458.
LINKS
EXAMPLE
Some solutions for n=4
..1..2....3..1....1..0....4..3....3..2....2..3....2..0....1..3....4..2....3..2
..2..3....4..2....0..2....2..1....2..1....3..4....0..1....2..4....3..1....1..0
..1..2....2..1....2..3....1..3....1..2....4..2....1..2....1..2....1..3....0..1
..3..4....1..3....3..1....0..1....3..4....2..1....2..3....2..1....3..1....2..3
CROSSREFS
Cf. A265458.
Sequence in context: A168562 A117514 A138437 * A121429 A368466 A337775
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 09 2015
STATUS
approved