OFFSET
0,3
FORMULA
a(n)=Sum{floor(kn/6), k=1,2,3,4,5}.
Empirical g.f.: x^2*(5*x^4+2*x^3+2*x^2+3*x+3) / ((x-1)^2*(x+1)*(x^2-x+1)*(x^2+x+1)). - Colin Barker, Mar 20 2013
MATHEMATICA
Table[Sum[Floor[k*n/6], {k, 1, 5}], {n, 0, 200}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Mar 08 2011
STATUS
approved