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A229840
Number of n X n 0..2 arrays x(i,j) with each element horizontally or vertically next to at least one element with value 2-x(i,j)
0
0, 15, 987, 453837, 1296261759, 23643209345079, 2745117942652795617
OFFSET
1,2
COMMENTS
Diagonal of A229847
EXAMPLE
Some solutions for n=3
..0..2..0....1..1..2....0..0..0....2..0..2....1..1..1....1..2..0....1..0..0
..1..0..0....1..1..0....2..2..2....1..1..2....0..2..1....1..0..2....1..2..2
..1..2..2....1..1..2....2..0..0....2..0..0....0..2..0....1..2..0....2..0..0
CROSSREFS
Sequence in context: A055413 A067408 A274713 * A102102 A196569 A019282
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 01 2013
STATUS
approved