A213984 Number of n X n 0..2 matrices whose square is also a 0..2 matrix

2, 24, 1003, 120133, 35799856, 24651985100

Offset

1,1

Comments

Column 2 of A213990

Links

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

Example

Some solutions for n=3
..0..1..1....1..0..1....0..2..0....0..1..0....1..1..2....0..0..0....0..1..2
..0..0..2....0..0..2....0..0..0....0..1..2....0..0..0....0..0..0....1..0..0
..0..0..0....0..1..0....0..0..0....0..0..0....0..0..0....0..0..0....0..1..0

Crossrefs

Sequence in context: A062029 A122551 A136524 * A129622 A268311 A362091

Adjacent sequences: A213981 A213982 A213983 * A213985 A213986 A213987

Keyword

nonn

Author

R. H. Hardin Jun 30 2012

Status

approved