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A203453
Number of n X n 0..2 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors
0
1, 3, 84, 8837, 5660631, 22078482448, 449985495293440, 48224646798077538850
OFFSET
1,2
COMMENTS
Diagonal of A203460
EXAMPLE
Some solutions for n=5
..2..2..2..0..0....2..2..1..1..0....0..2..2..2..2....1..1..0..0..0
..2..0..2..1..0....2..2..1..1..1....0..2..2..2..2....1..2..2..1..0
..2..1..2..1..0....0..1..2..2..1....0..1..0..0..0....2..2..2..1..0
..2..1..2..2..0....2..2..2..2..1....1..1..2..2..0....2..0..0..2..2
..2..2..2..2..0....2..2..0..0..0....1..1..2..2..0....2..2..2..2..2
CROSSREFS
Sequence in context: A160880 A261008 A217524 * A086264 A160878 A152791
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 02 2012
STATUS
approved