OFFSET
1,2
LINKS
Alois P. Heinz, Table of n, a(n) for n = 1..500
N. J. A. Sloane, Transforms
MAPLE
with(numtheory):
a:= proc(n) option remember; `if`(n<0, 0,
`if`(n=0, 1, tau(n) *a(n-1) +a(n-2)))
end:
seq(a(n), n=1..35); # Alois P. Heinz, Aug 06 2013
MATHEMATICA
a[n_] := a[n] = If[n < 0, 0, If[n == 0, 1, DivisorSigma[0, n]*a[n-1] + a[n-2]]];
Table[a[n], { n, 1, 35}] (* Jean-François Alcover, Nov 20 2024, after Alois P. Heinz *)
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jun 11 2002
STATUS
approved