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A198278 Number of 2nX2n 0..2 arrays with values 0..2 introduced in row major order and each element equal to exactly two horizontal and vertical neighbors 0
1, 4, 100, 8784, 2823604, 3337609528 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A198285

LINKS

Table of n, a(n) for n=1..6.

EXAMPLE

Some solutions for n=3

..0..0..1..1..2..2....0..0..1..1..1..1....0..0..1..1..0..0....0..0..1..1..0..0

..0..0..1..1..2..2....0..0..1..0..0..1....0..0..1..1..0..0....0..0..1..1..0..0

..1..1..2..2..0..0....2..2..1..0..0..1....1..1..0..0..2..2....1..1..0..0..1..1

..1..1..2..2..0..0....2..2..1..2..2..1....1..1..0..0..2..2....1..1..0..0..1..1

..2..2..1..1..2..2....0..0..1..2..2..1....2..2..1..1..0..0....0..0..1..1..0..0

..2..2..1..1..2..2....0..0..1..1..1..1....2..2..1..1..0..0....0..0..1..1..0..0

CROSSREFS

Sequence in context: A224385 A249939 A224018 * A202990 A324096 A202989

Adjacent sequences:  A198275 A198276 A198277 * A198279 A198280 A198281

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 23 2011

STATUS

approved

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Last modified April 6 08:06 EDT 2020. Contains 333267 sequences. (Running on oeis4.)