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 A372668 #8 May 10 2024 03:43:42
%S A372668 1,9,26,83,132,404,400,989,1199,2382,2096,5381,3922,8358,8525,12897,
%T A372668 10758,25517,16618,34116,30217,45156,34224,77503,50559,87512,77328,
%U A372668 119162,84364,198907,108928,196605,174258,249884,195499,374490,215930,386822,330878,500717
%N A372668 a(n) = (1/phi(n)) * Sum_{j=1..n} Sum_{k=1..n} phi(n*j*k).
%t A372668 Table[Sum[EulerPhi[n*j*k], {j, 1, n}, {k, 1, n}]/EulerPhi[n], {n, 1, 40}] (* _Vaclav Kotesovec_, May 10 2024 *)
%o A372668 (PARI) a(n) = sum(j=1, n, sum(k=1, n, eulerphi(n*j*k)))/eulerphi(n);
%Y A372668 Cf. A000010, A070639, A372669.
%K A372668 nonn
%O A372668 1,2
%A A372668 _Seiichi Manyama_, May 09 2024