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 A032254 #8 Sep 21 2018 02:20:49
%S A032254 1,1,2,5,8,16,29,59,124,287,670,1634,3992,9867,24320,60290,149124,
%T A032254 370146,918796,2286685,5697484,14227797,35583724,89168380,223794690,
%U A032254 562624780,1416520302,3571567951,9017077418,22794093212
%N A032254 "DHK" (bracelet, identity, unlabeled) transform of 1,2,3,4,...
%H A032254 Andrew Howroyd, <a href="/A032254/b032254.txt">Table of n, a(n) for n = 0..500</a>
%H A032254 C. G. Bower, <a href="/transforms2.html">Transforms (2)</a>
%o A032254 (PARI)
%o A032254 DHK(p,n)={my(q=((1+p)^2/(1-subst(p, x, x^2))-1)/2); p + (p^2-subst(p, x, x^2))/2 + sum(d=1, n, moebius(d)*(log(subst(1/(1+O(x*x^(n\d))-p), x, x^d))/d - subst(q + O(x*x^(n\d)), x, x^d)))/2}
%o A032254 seq(n)={Vec(1 + DHK(x/(1-x)^2 + O(x*x^n), n))} \\ _Andrew Howroyd_, Sep 21 2018
%K A032254 nonn
%O A032254 0,3
%A A032254 _Christian G. Bower_
%E A032254 a(0)=1 prepended by _Andrew Howroyd_, Sep 21 2018