OFFSET
0,3
LINKS
E. Angelini, k-chunks sum and division by k, post to the SeqFan list, Mar 22 2013
FORMULA
a(n) = 2 a(n-5) - a(n-10).
G.f.: x*(1 + 2*x + 3*x^2 + 4*x^3 + 5*x^4 + 4*x^5 + 3*x^6 + 2*x^7 + 6*x^8)/((1 - x)*(1 + x + x^2 + x^3 + x^4))^2.
a(n) = n unless n=4 (mod 5) in which case a(n) = 2n-4.
CROSSREFS
KEYWORD
nonn
AUTHOR
Eric Angelini and M. F. Hasler, Mar 23 2013
STATUS
approved