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 A327026 #5 Aug 25 2019 01:55:46
%S A327026 1,1,4,41,979,40549,2571724,231313681,28007660854,4392400716381,
%T A327026 866132386622878,209744116289535001,61192264076350570149,
%U A327026 21169177815206345045941,8568352429497412897973944,4011525608882608159230362521,2151041235686896366408288920529
%N A327026 a(n) = (1/n) Sum_{k=0..n} Sum_{d|n} phi(d) A241171(n/d, k) for n >= 1, a(0) = 1.
%p A327026 seq(add(A327027(n, k), k=0..n), n=0..18);
%t A327026 a[n_] := Sum[A327027[n, k], {k, 0, n}]; Table[a[n], {n, 0, 16}]
%Y A327026 Row sums of A327027.
%K A327026 nonn
%O A327026 0,3
%A A327026 _Peter Luschny_, Aug 20 2019