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 A309679 #5 Aug 12 2019 22:38:25
%S A309679 1,2,3,4,5,8,11,14,17,20,26,32,38,44,50,60,70,80,90,100,115,130,145,
%T A309679 160,175,198,221,244,267,290,324,358,392,426,460,508,556,604,652,700,
%U A309679 765,830,895,960,1025,1110,1195,1280,1365,1450,1561,1672,1783,1894,2005,2148,2291,2434,2577
%N A309679 G.f. A(x) satisfies: A(x) = A(x^5) / (1 - x)^2.
%F A309679 G.f.: Product_{k>=0} 1/(1 - x^(5^k))^2.
%t A309679 nmax = 58; A[_] = 1; Do[A[x_] = A[x^5]/(1 - x)^2 + O[x]^(nmax + 1) // Normal, nmax + 1]; CoefficientList[A[x], x]
%t A309679 nmax = 58; CoefficientList[Series[Product[1/(1 - x^(5^k))^2, {k, 0, Floor[Log[5, nmax]] + 1}], {x, 0, nmax}], x]
%Y A309679 Cf. A005706, A171238, A309677, A309678.
%K A309679 nonn
%O A309679 0,2
%A A309679 _Ilya Gutkovskiy_, Aug 12 2019