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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A199246

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..154

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 * A173842 A131444 A291541

Adjacent sequences:  A199237 A199238 A199239 * A199241 A199242 A199243

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 04 2011

STATUS

approved

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Last modified September 29 12:15 EDT 2020. Contains 337431 sequences. (Running on oeis4.)