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 A336551 #5 Jul 28 2020 14:01:35
%S A336551 0,0,0,1,0,0,0,3,2,0,0,1,0,0,0,7,0,2,0,1,0,0,0,3,4,0,8,1,0,0,0,15,0,0,
%T A336551 0,5,0,0,0,3,0,0,0,1,2,0,0,7,6,4,0,1,0,8,0,3,0,0,0,1,0,0,2,31,0,0,0,1,
%U A336551 0,0,0,11,0,0,4,1,0,0,0,7,26,0,0,1,0,0,0,3,0,2,0,1,0,0,0,15,0,6,2,9,0,0,0,3,0
%N A336551 a(n) = A003557(n) - 1.
%H A336551 Antti Karttunen, <a href="/A336551/b336551.txt">Table of n, a(n) for n = 1..65537</a>
%F A336551 a(n) = A066503(n) / A007947(n).
%o A336551 (PARI) A336551(n) = { my(f=factor(n)); for(i=1, #f~, f[i, 2] = f[i, 2]-1); (factorback(f)-1); };
%Y A336551 Cf. A003557, A007947, A066503.
%K A336551 nonn
%O A336551 1,8
%A A336551 _Antti Karttunen_, Jul 28 2020