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A199245
Number of nX7 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 two horizontal or vertical neighbors
0
19, 288, 2080, 134821, 3190670, 27337776, 2013526831, 52332203186
OFFSET
1,1
COMMENTS
Column 7 of A199246
EXAMPLE
Some solutions for n=4
..0..1..0..1..0..0..2....0..1..0..2..0..2..1....0..1..0..2..0..1..2
..2..0..1..2..0..0..1....1..0..1..0..2..1..2....1..0..2..0..1..2..0
..0..2..0..1..1..2..2....0..2..0..2..1..2..1....0..1..0..1..2..0..2
..1..0..2..1..1..2..2....2..0..1..0..2..1..2....1..2..1..2..1..2..0
CROSSREFS
Sequence in context: A328916 A081045 A155017 * A152591 A051562 A330846
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 04 2011
STATUS
approved