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A213985
Number of n X n 0..3 matrices whose square is also a 0..3 matrix
0
2, 36, 2546, 604639, 421195466, 801373175814
OFFSET
1,1
COMMENTS
Column 3 of A213990
EXAMPLE
Some solutions for n=3
..1..0..0....0..2..1....1..2..1....0..3..0....0..0..2....0..1..3....0..1..0
..0..0..3....0..0..0....0..0..0....0..1..1....0..1..1....0..0..1....0..1..0
..0..0..1....0..0..1....1..0..0....0..2..0....0..1..1....0..0..0....0..1..1
CROSSREFS
Sequence in context: A303503 A178949 A200571 * A203021 A319507 A001070
KEYWORD
nonn
AUTHOR
R. H. Hardin Jun 30 2012
STATUS
approved