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A203839
Number of n X n 0..3 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors
0
1, 4, 262, 84346, 215340781, 5191761888989, 962798716189325069
OFFSET
1,2
COMMENTS
Diagonal of A203846
EXAMPLE
Some solutions for n=4
..1..3..3..0....0..3..3..2....3..3..2..0....2..2..0..0....0..2..3..3
..1..3..3..2....2..3..3..2....3..3..2..1....2..2..0..0....1..2..3..3
..2..3..3..2....2..1..0..2....0..0..3..3....0..3..3..1....3..3..0..3
..2..2..2..2....2..2..2..2....0..0..3..3....0..3..3..1....3..3..3..3
CROSSREFS
Sequence in context: A112982 A352332 A061788 * A052136 A089667 A119008
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 06 2012
STATUS
approved