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A199222 Number of n X n 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 one horizontal or vertical neighbors 0
1, 6, 110, 55956, 49412210, 70698654245 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A199230

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A241702 A302866 A243511 * A260026 A112499 A272391

Adjacent sequences:  A199219 A199220 A199221 * A199223 A199224 A199225

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 04 2011

STATUS

approved

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Last modified August 3 01:07 EDT 2021. Contains 346429 sequences. (Running on oeis4.)