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 A057176 #21 Sep 04 2017 23:28:16
%S A057176 1,1,2,4,1,2,4,9,2,4,9,30,15,4,9,30,97,84,84,26,15,127,308,30,15,127,
%T A057176 898,24,913,97,24,913,308,69,2,4,9,30,2996,4217,308,560,97,69,1040,11,
%U A057176 69,868,9,30,2996,7327,14566,13618,39,11544,26,1938,913
%N A057176 a(0) = 1; for n >= 1, a(n) = Sum_{j=0..a(n-1) mod n} a(j).
%H A057176 Michael De Vlieger, <a href="/A057176/b057176.txt">Table of n, a(n) for n = 0..10000</a>
%F A057176 a(0) = 1; for n >= 1, a(n) = Sum_{j=0..a(n-1) mod n} a(j).
%t A057176 a[m_] := Sum[a[j], {j, 0, Mod[a[m-1], m]}]; vv={1}; Do[a[n]=If[n==0, 1, b]; v=a[n+1]; vv=Insert[vv, v, -1]; b=v, {n, 0, 50}]; vv
%K A057176 nonn
%O A057176 0,3
%A A057176 _Leroy Quet_, Aug 03 2003
%E A057176 More terms from _Farideh Firoozbakht_, Aug 03 2003