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A199195
Number of nX2 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
2
1, 1, 14, 21, 424, 571, 14479, 18551, 541753, 677755, 21602174, 26710635, 900441480, 1106584141, 38750819148, 47454881357, 1708021796194, 2086972918493, 76696731839316, 93565751359627, 3495631904879766, 4259451181263175
OFFSET
1,3
COMMENTS
Column 2 of A199201
LINKS
EXAMPLE
Some solutions for n=4
..0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1
..1..2....2..3....2..3....1..0....2..3....2..0....2..3....2..0....2..0....1..2
..0..3....3..1....0..2....2..3....3..1....3..2....0..1....1..3....3..1....3..0
..3..2....0..2....3..1....3..2....2..0....1..3....3..2....3..2....2..3....2..3
CROSSREFS
Sequence in context: A351689 A166628 A199250 * A373611 A291618 A266214
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 03 2011
STATUS
approved