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A197101
Half the number of n X n 0..3 arrays with no element equal to the average of its horizontal and vertical neighbors
0
2, 78, 50831, 478107878, 63216096026066, 117783697209668555853
OFFSET
1,1
COMMENTS
Diagonal of A197109
EXAMPLE
Some solutions for 4X4
..1..0..0..0....1..0..3..0....1..0..3..2....1..0..3..2....1..0..2..0
..0..0..1..1....0..0..1..1....0..0..0..3....0..0..2..0....0..0..2..2
..0..0..0..0....0..1..3..3....0..1..1..3....0..1..1..2....0..1..2..3
..1..1..1..1....0..2..0..0....1..0..1..3....1..0..1..3....1..3..3..1
CROSSREFS
Sequence in context: A157062 A008273 A231240 * A245674 A342979 A166052
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 10 2011
STATUS
approved