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A199648
Number of n X n 0..2 arrays with values 0..2 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors
0
1, 14, 2584, 3695683, 39209840355, 3083761998081891, 1797997097480559332224, 7771716024559573445914487875
OFFSET
1,2
COMMENTS
Diagonal of A199655
EXAMPLE
Some solutions for n=3
..0..1..0....0..0..1....0..1..2....0..0..1....0..1..0....0..1..1....0..0..0
..0..0..1....1..0..2....0..1..2....2..2..2....2..0..0....1..2..2....0..1..1
..2..0..1....2..1..0....1..1..0....1..1..2....2..0..1....1..2..1....0..1..0
CROSSREFS
Sequence in context: A080690 A268424 A079918 * A271401 A013719 A145188
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 08 2011
STATUS
approved