OFFSET
1,1
COMMENTS
Row 4 of A209115.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 3*a(n-1) - 3*a(n-2) + 2*a(n-3) - 3*a(n-4) + 3*a(n-5) - a(n-6).
Empirical g.f.: x*(5 + 7*x + 4*x^2 + 11*x^3 - 3*x^4) / ((1 - x)^4*(1 + x + x^2)). - Colin Barker, Jul 08 2018
EXAMPLE
Some solutions for n=6:
-2 -4 -5 -4 -4 -6 -3 -6 -5 -6 -4 -5 -6 -5 -5 -6
0 1 6 2 -1 4 -2 6 -5 -3 0 5 1 -5 1 6
-1 1 -2 1 4 -3 1 3 6 3 3 1 0 5 5 -1
3 2 1 1 1 5 4 -3 4 6 1 -1 5 5 -1 1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 05 2012
STATUS
approved