A213989 Number of n X n 0..7 matrices whose square is also a 0..7 matrix

3, 148, 40370, 56599992, 361204218672

Offset

1,1

Comments

Column 7 of A213990

Links

Table of n, a(n) for n=1..5.

Example

Some.solutions.for.n=3
..0..1..7....0..5..3....0..2..1....0..1..7....0..2..5....2..0..0....0..7..0
..0..0..5....0..0..0....0..0..0....0..0..2....0..0..0....0..1..1....0..1..0
..0..0..0....0..0..0....0..3..2....0..0..0....0..0..1....0..0..1....0..6..0

Crossrefs

Sequence in context: A203699 A003009 A037122 * A181748 A118840 A111816

Adjacent sequences: A213986 A213987 A213988 * A213990 A213991 A213992

Keyword

nonn

Author

R. H. Hardin Jun 30 2012

Status

approved