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.
%I A073806 #9 Aug 01 2019 11:31:50
%S A073806 1,2,4,4,4,6,6,4,4,8,4,16,8,8,12,4,8,8,4,16,12,8,8,12,8,12,12,24,4,18,
%T A073806 8,16,12,12,18,12,8,8,18,16,6,15,12,16,12,12,16,16,8,16,18,32,8,18,12,
%U A073806 16,12,8,4,48,4,16,24,4,24,18,8,32,18,24,4,16,16,12,32,16,18,24,4,16,6
%N A073806 Number of divisors of sum of square of divisors.
%H A073806 Amiram Eldar, <a href="/A073806/b073806.txt">Table of n, a(n) for n = 1..10000</a>
%F A073806 a(n) = A000005(A001157(n)) = d(sigma(2, n)).
%e A073806 n = 10: D = {1,2,5,10}, sigma(2,10) = 1 + 4 + 25 + 100 = 130, D(130) = {1,2,5,10,13,26,65,130}, so a(10) = 8.
%t A073806 a[n_] := DivisorSigma[0, DivisorSigma[2, n]]; Array[a, 81] (* _Amiram Eldar_, Aug 01 2019 *)
%Y A073806 Cf. A000005, A000203, A001157, A062068, A073802-A073813.
%K A073806 nonn
%O A073806 1,2
%A A073806 _Labos Elemer_, Aug 13 2002