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 A038045 #12 Feb 05 2022 16:01:14
%S A038045 1,1,2,4,7,11,17,23,33,43,58,68,97,109,138,168,211,227,298,316,401,
%T A038045 459,537,559,723,771,892,988,1173,1201,1507,1537,1791,1947,2190,2324,
%U A038045 2825,2861,3195,3437,3999,4039,4794,4836,5481,5971,6552,6598,7775
%N A038045 Shifts left under transform T where Ta is phi DCONV a.
%C A038045 Eigensequence of triangle A054523; i.e., multiplication by A054523 shifts the sequence to (1, 2, 4, ...). - _Gary W. Adamson_, Apr 26 2009
%F A038045 a(1) = 1; a(n+1) = Sum_{d|n} phi(n/d) * a(d). - _Ilya Gutkovskiy_, Feb 23 2020
%t A038045 a[1] = 1; a[n_] := a[n] = Sum[EulerPhi[(n-1)/d]*a[d], {d, Divisors[n-1]}]; Table[a[n], {n, 1, 100}] (* _Vaclav Kotesovec_, Feb 23 2020 *)
%Y A038045 Cf. A000010, A054523.
%K A038045 nonn,eigen
%O A038045 1,3
%A A038045 _Christian G. Bower_