OFFSET
1,1
COMMENTS
Row 5 of A200181.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = a(n-2) +a(n-3) +a(n-4) -a(n-5) -a(n-6) -a(n-7) +a(n-9) for n>10.
Empirical g.f.: x*(2 + 12*x + 13*x^2 + 10*x^3 + 2*x^4 - x^5 - 3*x^6 + 2*x^8 + x^9) / ((1 - x)^3*(1 + x)^2*(1 + x^2)*(1 + x + x^2)). - Colin Barker, May 19 2018
EXAMPLE
Some solutions for n=6:
..0....6....5....5....4....3....0....5....2....2....2....1....2....4....2....6
..1....1...-2....6...-2...-1...-1....6....3....3....3....2...-1....1....3...-1
..2....2...-1...-3...-1....0....0...-4...-1....4...-2...-2....0....2....0....0
.-2...-5....0...-2....0....1....1...-3....0...-5...-1...-1....1...-4....1...-3
.-1...-4...-2...-6...-1...-3....0...-4...-4...-4...-2....0...-2...-3...-6...-2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 13 2011
STATUS
approved