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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
OFFSET
1,2
COMMENTS
Diagonal of A199230
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 04 2011
STATUS
approved