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A199193
Number of n X n 0..3 arrays with values 0..3 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, 1, 114, 11734, 86954982, 329877369234
OFFSET
1,3
COMMENTS
Diagonal of A199201.
EXAMPLE
Some solutions for n=4
..0..1..2..1....0..1..0..2....0..1..0..2....0..1..0..1....0..1..2..0
..3..2..0..2....2..3..2..0....2..0..3..1....1..2..3..0....3..2..1..3
..0..1..3..0....3..1..3..1....3..1..2..0....2..3..0..3....0..1..3..1
..2..3..1..3....2..0..1..3....2..3..1..3....3..2..1..2....2..0..2..3
CROSSREFS
Cf. A199201.
Sequence in context: A112485 A220685 A199249 * A188694 A188507 A189616
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 03 2011
STATUS
approved