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A198602
Number of 2nX12 0..3 arrays with values 0..3 introduced in row major order and each element equal to exactly two horizontal and vertical neighbors
0
41, 15761, 6671450, 2934981667, 1308245895665
OFFSET
1,1
COMMENTS
Column 6 of A198604
EXAMPLE
Some solutions for n=2
..0..0..0..0..0..0..1..1..0..0..1..1....0..0..1..1..0..0..2..2..2..2..2..2
..0..1..1..2..2..0..1..1..0..0..1..1....0..0..1..1..0..0..2..3..3..1..1..2
..0..1..1..2..2..0..3..3..2..2..0..0....1..1..2..2..3..3..2..3..3..1..1..2
..0..0..0..0..0..0..3..3..2..2..0..0....1..1..2..2..3..3..2..2..2..2..2..2
CROSSREFS
Sequence in context: A289416 A199255 A199200 * A214338 A084275 A218377
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 27 2011
STATUS
approved