cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A284910 a(n) = A000009(A000041(n)).

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%I A284910 #9 Apr 07 2017 01:36:19
%S A284910 1,1,1,2,3,5,12,27,89,296,1426,7108,58499,483330,6711480,109420549,
%T A284910 2973772212,98872765938,6193924614094,495007377762304,
%U A284910 79850366709300780,18640233243121488514,9131454268089695383606,7218306932686390208993280,13823416565311581226765397400
%N A284910 a(n) = A000009(A000041(n)).
%H A284910 Alois P. Heinz, <a href="/A284910/b284910.txt">Table of n, a(n) for n = 0..40</a>
%p A284910 with(numtheory):
%p A284910 b:= proc(n) option remember; `if`(n=0, 1, add(add(
%p A284910      `if`(d::odd, d, 0), d=divisors(j))*b(n-j), j=1..n)/n)
%p A284910     end:
%p A284910 a:= n-> b(combinat[numbpart](n)):
%p A284910 seq(a(n), n=0..22);
%t A284910 Table[PartitionsQ@ PartitionsP@ n, {n,0, 50}] (* _Indranil Ghosh_, Apr 07 2017 *)
%Y A284910 Cf. A000009, A000041, A058699, A284908, A284909.
%K A284910 nonn
%O A284910 0,4
%A A284910 _Alois P. Heinz_, Apr 05 2017