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A223097
Number of n X n 0..2 arrays with exactly floor(n X n/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order
0
1, 6, 546, 737254, 5423134897, 460895553576913, 178267875091681095647, 831156761247263067556854883, 16574854310429531539559558547925220
OFFSET
1,2
COMMENTS
Diagonal of A223104
EXAMPLE
Some solutions for n=3
..0..0..0....0..1..2....0..1..0....0..1..0....0..1..1....0..1..2....0..1..2
..0..1..0....0..1..1....0..2..2....1..2..1....0..2..0....2..0..1....2..2..1
..2..1..0....2..2..1....1..1..2....0..0..2....0..2..2....0..1..2....2..0..1
CROSSREFS
Sequence in context: A121835 A159531 A276490 * A213959 A358487 A341871
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 14 2013
STATUS
approved