A213985 Number of n X n 0..3 matrices whose square is also a 0..3 matrix

2, 36, 2546, 604639, 421195466, 801373175814

Offset

1,1

Comments

Column 3 of A213990

Links

Table of n, a(n) for n=1..6.

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

Adjacent sequences: A213982 A213983 A213984 * A213986 A213987 A213988

Keyword

nonn

Author

R. H. Hardin Jun 30 2012

Status

approved