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A199360
Number of n X 3 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 one or two horizontal or vertical neighbors.
0
0, 0, 20, 23, 1655, 39597, 336788, 2130707, 97253704, 2328983293, 27777628803, 109663812046, 7330508486557, 181851333483598, 2032109646360324, 8979878533633165, 588003317861300327
OFFSET
1,3
COMMENTS
Column 3 of A199363.
EXAMPLE
Some solutions for n=4
..0..0..1....0..0..1....0..0..0....0..0..0....0..0..0....0..1..1....0..0..0
..0..1..1....2..0..1....1..2..2....1..2..2....1..1..1....0..0..1....1..2..2
..2..2..2....2..3..1....1..3..2....1..2..3....2..2..3....2..2..3....1..1..2
..3..3..3....2..3..3....1..3..3....1..3..3....2..3..3....2..3..3....3..3..3
CROSSREFS
Cf. A199363.
Sequence in context: A303303 A045563 A013339 * A199585 A093716 A117737
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 05 2011
STATUS
approved