OFFSET
1,5
LINKS
G. C. Greubel, Table of n, a(n) for n = 1..5000
FORMULA
From Chai Wah Wu, Jun 10 2020: (Start)
a(n) = a(n-1) + a(n-12) - a(n-13) for n > 13.
G.f.: x*(x^10 + x^9 + x^7 + x^4 + x^2)/(x^13 - x^12 - x + 1). (End)
MATHEMATICA
PROG
(PARI) for(n=1, 50, print1(floor(sum(k=1, n, frac(k/6))), ", ")) \\ G. C. Greubel, Oct 29 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Aug 19 2011
STATUS
approved