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A199141
Number of n X n 0..3 arrays with values 0..3 introduced in row major order and each element equal to one or two horizontal and vertical neighbors
0
0, 3, 132, 125468, 839006010, 44832664800117
OFFSET
1,2
COMMENTS
Diagonal of A199149
EXAMPLE
Some solutions for n=4
..0..0..1..1....0..0..1..1....0..0..1..1....0..1..1..1....0..0..1..1
..1..1..0..0....2..2..3..3....1..1..1..0....0..0..2..2....2..3..3..0
..2..2..0..3....2..2..0..0....2..0..0..0....2..2..3..2....2..0..0..0
..0..0..3..3....0..0..2..2....2..2..2..2....1..1..3..2....3..3..3..3
CROSSREFS
Sequence in context: A262643 A048796 A213203 * A152435 A239426 A157086
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 03 2011
STATUS
approved