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A203339
Number of n X n 0..4 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors
0
1, 5, 635, 503409, 3742207236, 360171255368417
OFFSET
1,2
COMMENTS
Diagonal of A203346
EXAMPLE
Some solutions for n=5
..4..4..3..1..0....2..2..2..3..3....4..4..0..4..4....0..3..3..2..1
..4..4..3..4..4....2..4..4..3..3....4..4..2..4..4....4..4..3..2..2
..3..3..0..4..4....3..4..4..2..3....4..3..3..2..4....4..4..0..1..2
..1..1..4..4..0....3..4..2..4..4....4..3..3..4..4....3..4..3..4..4
..1..1..4..4..0....2..4..4..4..4....4..4..4..4..4....2..4..4..4..4
CROSSREFS
Sequence in context: A060758 A348081 A256070 * A253690 A068421 A142535
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 31 2011
STATUS
approved