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 A062956 #19 Sep 22 2021 12:49:15 %S A062956 2,3,8,5,18,14,24,18,50,22,72,39,56,60,128,51,162,76,120,105,242,92, %T A062956 240,150,234,162,392,116,450,248,320,264,408,210,648,333,456,312,800, %U A062956 246,882,430,528,495,1058,376,1008,490,800,612,1352,477,1080,660,1008 %N A062956 a(n) = h(n^2) - h(n), where h(n) is the half-totient function (A023022). %F A062956 a(n) = (n-1)*A023022(n), n >= 3. %o A062956 (PARI) h(n) = eulerphi(n)/2; %o A062956 a(n) = h(n^2)-h(n); %Y A062956 Cf. A000010, A023022. %K A062956 nonn %O A062956 3,1 %A A062956 _Jason Earls_, Jul 22 2001