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A199240
Number of nX2 0..2 arrays with values 0..2 introduced in row major order, the number of instances of each value within one of each other, and every element equal to zero or two horizontal or vertical neighbors
1
1, 2, 2, 12, 36, 39, 288, 836, 888, 7380, 22149, 23706, 201515, 611372, 654468, 5704006, 17499974, 18760333, 166063522, 513160156, 550594928, 4932198432, 15327377362, 16456851660, 148765279666, 464332349724, 498808175988
OFFSET
1,2
COMMENTS
Column 2 of A199246
LINKS
EXAMPLE
Some solutions for n=4
..0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1
..1..2....1..2....1..2....2..0....2..0....2..0....2..0....1..0....2..0....1..0
..2..0....2..1....0..1....1..2....0..2....1..2....0..1....0..2....1..2....2..1
..1..2....0..2....2..0....2..1....2..1....0..1....1..2....2..1....2..0....0..2
CROSSREFS
Sequence in context: A185344 A237275 A087131 * A349529 A173842 A352526
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 04 2011
STATUS
approved