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A192766
Number of n X n symmetric 0..3 arrays with each element equal to at least one horizontal or vertical neighbor, containing at least one 3 and with new values 0..3 introduced in lower triangular row major order
0
0, 0, 0, 17, 7720, 4829792, 6716752296, 25512182673851, 280268522844817397, 9139496699518220983774, 891049711767000782484301987
OFFSET
1,4
EXAMPLE
Some solutions for 5X5
..0..0..2..2..3....0..0..1..2..2....0..0..1..1..0....0..0..1..3..0
..0..1..1..3..3....0..1..1..3..1....0..1..1..2..0....0..0..1..3..0
..2..1..1..1..1....1..1..1..3..1....1..1..2..2..3....1..1..2..2..3
..2..3..1..0..0....2..3..3..1..1....1..2..2..3..3....3..3..2..3..3
..3..3..1..0..0....2..1..1..1..1....0..0..3..3..3....0..0..3..3..3
CROSSREFS
Sequence in context: A287038 A198406 A198533 * A166326 A203678 A257044
KEYWORD
nonn
AUTHOR
R. H. Hardin Jul 09 2011
STATUS
approved