A213988 Number of n X n 0..6 matrices whose square is also a 0..6 matrix.

3, 126, 28328, 29365738, 124477495732

Offset

1,1

Comments

Column 6 of A213990

Links

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

Example

Some.solutions.for.n=3
..2..0..1....0..1..0....0..6..4....0..3..6....0..4..0....0..5..0....0..0..4
..0..1..6....0..0..1....0..1..0....0..1..0....0..0..0....0..1..0....0..1..3
..0..0..0....3..3..0....0..0..0....0..0..0....1..5..0....0..3..0....0..1..1

Crossrefs

Sequence in context: A324152 A274314 A157592 * A159319 A086154 A133122

Adjacent sequences: A213985 A213986 A213987 * A213989 A213990 A213991

Keyword

nonn

Author

R. H. Hardin, Jun 30 2012

Status

approved