OFFSET
1,1
COMMENTS
Row 4 of A203291.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 3*a(n-1) -a(n-2) -3*a(n-3) +7*a(n-6) -3*a(n-7) -2*a(n-8) -2*a(n-9) -3*a(n-10) +7*a(n-11) -3*a(n-14) -a(n-15) +3*a(n-16) -a(n-17).
EXAMPLE
Some solutions for n=3
.-3....0...-3...-3...-3...-2...-3...-3...-3...-3...-2...-1...-3...-3...-3...-2
.-3....0....0...-3...-2....0...-2...-3...-3...-3...-2...-1...-2...-1...-3...-2
.-2....0....0...-3...-2....0...-1...-2...-1....0...-2...-1...-2....0...-3...-1
.-1....0....0....0...-1....0...-1...-2...-1....0....0....0....0....0...-3...-1
..1....0....0....0....1....0....1....2....2....0....0....0....0....0....3....1
..2....0....0....3....2....0....1....2....2....0....2....1....1....0....3....1
..3....0....0....3....2....0....2....3....2....3....2....1....3....1....3....1
..3....0....3....3....3....2....3....3....2....3....2....1....3....3....3....3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 31 2011
STATUS
approved