OFFSET
1,1
COMMENTS
Nonsingular matrices = binomial(n+4,4) - a(n).
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
EXAMPLE
All solutions for n=2:
..0..0....0..0....0..0....2..2....0..0....0..0....1..1....1..1....0..0
..1..2....0..0....0..2....2..2....1..1....0..1....1..1....2..2....2..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 06 2011
STATUS
approved