OFFSET
0,3
LINKS
Harvey P. Dale, Table of n, a(n) for n = 0..1000
EXAMPLE
Since d(8) = 4, a(8) = a(7) +a(6) +a(5) +a(4) {4 terms}. So a(8) = 29 +20 +9 +6 =64.
MATHEMATICA
Module[{lst={1}, n=1}, Do[AppendTo[lst, Total[Take[lst, -DivisorSigma[0, n]]]]; n++, {40}]; lst] (* Harvey P. Dale, May 01 2012 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Leroy Quet, Jul 16 2000
STATUS
approved