OFFSET
1,1
COMMENTS
Row 4 of A225987.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..115
EXAMPLE
Some solutions for n=1
.-2..3...-2..3...-2..3....3..3...-2.-2...-2..3...-2.-2...-2.-2...-2..3...-2..3
.-2..3....3.-2....3..3...-2..3...-2..3...-2..3...-2..3...-2..3....3.-2....3.-2
..3..3....3..3...-2..3...-2..3...-2.-2...-2..3...-2.-2...-2.-2....3..3...-2..3
.-2..3....3..3....3..3....3..3...-2..3....3..3...-2.-2....3.-2....3..3....3..3
..3..3....3.-2...-2..3....3.-2...-2.-2....3..3....3.-2...-2.-2...-2..3....3..3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 22 2013
STATUS
approved