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A184100
One quarter the number of n X n toroidal 0..3 arrays with each element having the sum of its vertical neighbors equal to the sum of its horizontal neighbors
0
1, 4, 85, 484, 3661, 28900, 137845, 1322500
OFFSET
1,2
COMMENTS
One quarter the number of solutions in 0..3 of a 1-d velocity-one wave equation utt=uxx on a periodic grid
Diagonal of A184101
EXAMPLE
Some solutions for 5X5
..2..0..3..3..0....1..2..1..1..3....2..1..1..2..1....3..1..2..1..3
..0..2..0..3..3....2..1..2..3..0....1..0..2..2..2....2..3..2..2..1
..3..0..2..0..3....0..2..3..1..2....0..2..1..2..2....1..3..3..2..1
..3..3..0..2..0....2..2..1..2..1....3..1..2..1..0....2..1..3..2..2
..0..3..3..0..2....3..1..1..1..2....1..3..1..0..2....2..2..0..3..3
CROSSREFS
Sequence in context: A225164 A229185 A360741 * A059830 A358439 A189831
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 09 2011
STATUS
approved