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A199093
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 two or fewer horizontal or vertical neighbors
0
1, 6, 280, 732964, 5569129037, 114472439855502
OFFSET
1,2
COMMENTS
Diagonal of A199101
EXAMPLE
Some solutions for n=3
..0..1..0....0..0..1....0..1..2....0..1..2....0..1..0....0..1..2....0..0..1
..2..2..1....2..1..1....2..1..0....2..2..1....2..1..2....0..1..2....2..2..1
..2..0..1....2..0..2....0..1..2....1..0..0....0..1..2....2..0..1....2..0..1
CROSSREFS
Sequence in context: A288796 A199097 A342983 * A163015 A049679 A201139
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 02 2011
STATUS
approved