OFFSET
1,1
COMMENTS
Row 3 of A223453.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..38
Project Euler, Problem 572: Idempotent matrices
EXAMPLE
Some solutions for n=3
..3.-2..0....1.-1..1....0.-3..3....0.-3..3....0..0..0....0..0..0....0..2..0
..3.-2..0...-3..3.-3....0..3.-3....0..1..0....2..3.-2...-3..3.-3....0..1..0
..2.-2..1...-3..3.-3....0..2.-2....0..0..1....2..3.-2...-2..2.-2....0..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 09 2013
STATUS
approved