OFFSET
1,1
COMMENTS
Row 6 of A209115.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 4*a(n-1) - 6*a(n-2) + 5*a(n-3) - 5*a(n-4) + 7*a(n-5) - 8*a(n-6) + 7*a(n-7) - 5*a(n-8) + 5*a(n-9) - 6*a(n-10) + 4*a(n-11) - a(n-12) for n > 13.
Empirical g.f.: x*(15 + 178*x + 511*x^2 + 893*x^3 + 1032*x^4 + 1066*x^5 + 854*x^6 + 561*x^7 + 155*x^8 + 26*x^9 - 23*x^10 + 16*x^11 - 4*x^12) / ((1 - x)^6*(1 + x + x^2)*(1 + x + x^2 + x^3 + x^4)). - Colin Barker, Jul 08 2018
EXAMPLE
Some solutions for n=6:
-6 -4 -6 -5 -5 -6 -4 -5 -6 -5 -5 -3 -6 -5 -6 -6
1 0 -1 4 -2 0 3 3 2 -4 -4 -3 4 -2 -5 3
5 -2 -5 -5 -1 2 -2 -5 -3 5 2 2 2 0 2 3
-3 -2 2 4 3 -2 0 4 6 -3 0 -2 -2 0 6 -1
2 5 5 -2 -1 2 0 1 1 2 5 5 -1 6 5 5
1 3 5 4 6 4 3 2 0 5 2 1 3 1 -2 -4
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 05 2012
STATUS
approved