A284908 a(n) = A000009(A000009(n)).

1, 1, 1, 1, 1, 2, 2, 3, 4, 6, 10, 15, 27, 46, 89, 192, 390, 864, 2304, 5718, 16444, 53250, 173682, 618784, 2556284, 11086968, 53466624, 299016608, 1780751883, 11784471548, 94036004868, 795888123110, 7723778471936, 91117574462854, 1168225267521350

Offset

0,6

Links

Alois P. Heinz, Table of n, a(n) for n = 0..70

Maple

with(numtheory):
b:= proc(n) option remember; `if`(n=0, 1, add(add(
      `if`(d::odd, d, 0), d=divisors(j))*b(n-j), j=1..n)/n)
    end:
a:= n-> b(b(n)):
seq(a(n), n=0..35);

Mathematica

Table[PartitionsQ@ PartitionsQ@ n, {n, 0, 50}] (* Indranil Ghosh, Apr 07 2017 *)

Crossrefs

Cf. A000009, A000041, A058699, A284909, A284910.

Sequence in context: A214448 A039829 A143588 * A329695 A103599 A032245

Adjacent sequences: A284905 A284906 A284907 * A284909 A284910 A284911

Keyword

nonn

Author

Alois P. Heinz, Apr 05 2017

Status

approved