OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..35
FORMULA
Empirical: a(n) = 7*a(n-1) -6*a(n-2) -60*a(n-3) +139*a(n-4) +94*a(n-5) -507*a(n-6) +148*a(n-7) +690*a(n-8) -428*a(n-9) -372*a(n-10) +272*a(n-11) +72*a(n-12) -48*a(n-13)
EXAMPLE
Some solutions for n=5
..2...-1....1...-1....0...-2....0...-1....0....2...-2...-1...-1...-2...-2....0
..0....0....2...-1...-1....0....2...-1...-1....0...-1....0....0...-2....1....2
..1....1....1...-1...-1...-2....2...-1...-2....1...-2...-1....1...-1...-2....0
..2...-2....0...-2....0...-2....0...-1...-2....0...-1...-2....0...-1....1....1
..1....1....1....0...-2...-1....1....2...-2....1...-2....0....1...-2....2....0
..0....2....2...-2....0...-2....1...-1...-2....1...-1...-2....0....0....2....1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 16 2012
STATUS
approved