OFFSET
1,1
COMMENTS
Row 3 of A202962.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 2*a(n-1) -a(n-3) -2*a(n-5) +2*a(n-6) +a(n-8) -2*a(n-10) +a(n-11).
Empirical g.f.: 2*x*(1 + 39*x + 125*x^2 + 368*x^3 + 503*x^4 + 666*x^5 + 499*x^6 + 384*x^7 + 120*x^8 + 55*x^9) / ((1 - x)^5*(1 + x)^2*(1 + x^2)*(1 + x + x^2)). - Colin Barker, Jun 03 2018
EXAMPLE
Some solutions for n=5:
..0....5....5....5...-5....2...-4...-1...-3....3....2...-2...-5....0...-1...-2
.-2....0....2...-2...-2....0....3...-5...-5...-4...-1....5....0...-4....2....5
..0...-1...-5...-4....4...-4....4...-1....1...-3...-3...-4....2....5....1...-1
..2....0...-2....1....2...-2...-2....2....4....4....0...-1....4....4....3....0
..0...-4....0....0....1....4...-1....5....3....0....2....2...-1...-5...-5...-2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 26 2011
STATUS
approved