OFFSET
1,1
COMMENTS
Row 6 of A199847.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 3*a(n-1) -2*a(n-2) -a(n-3) +2*a(n-5) -a(n-6) -a(n-7) +2*a(n-8) -a(n-10) -2*a(n-11) +3*a(n-12) -a(n-13) for n>14.
Empirical g.f.: x*(63 + 3*x - 22*x^2 + 8*x^3 + 45*x^4 - 4*x^5 - 24*x^6 + 32*x^7 + 19*x^8 - 27*x^9 - 43*x^10 + 39*x^11 + 8*x^12 - 9*x^13) / ((1 - x)^6*(1 + x)*(1 + x + x^2)*(1 + x + x^2 + x^3 + x^4)). - Colin Barker, May 16 2018
EXAMPLE
Some solutions for n=6:
..5....6....5....5....2....1....3....2....3....1....2....4....4....4....2....5
..4...-2....6....0....3....2....1....3....3...-1....0....2....4....3....3....0
..2...-1....1...-1....3....3...-2....2....3...-1....1....0....2....2....0....1
.-4....0...-1....0....1....0...-1....0...-2....0....2....0...-4...-2...-2...-1
.-3....0...-6...-2...-3...-3....0...-4...-2....1....0...-1...-3...-2...-1...-1
.-4...-3...-5...-2...-6...-3...-1...-3...-5....0...-5...-5...-3...-5...-2...-4
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 11 2011
STATUS
approved