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 A020734 #10 Aug 07 2016 09:28:29
%S A020734 4,10,25,63,159,402,1017,2573,6510,16472,41679,105461,266850,675216,
%T A020734 1708513,4323086,10938795,27678662,70035898,177213300,448406526,
%U A020734 1134612428,2870933600,7264383443,18381221638,46510390257,117686215012,297783895756,753488830979
%N A020734 Pisot sequence L(4,10).
%H A020734 Colin Barker, <a href="/A020734/b020734.txt">Table of n, a(n) for n = 0..1000</a>
%o A020734 (PARI) pisotL(nmax, a1, a2) = {
%o A020734 a=vector(nmax); a[1]=a1; a[2]=a2;
%o A020734 for(n=3, nmax, a[n] = ceil(a[n-1]^2/a[n-2]));
%o A020734 a
%o A020734 }
%o A020734 pisotL(50, 4, 10) \\ _Colin Barker_, Aug 07 2016
%Y A020734 See A008776 for definitions of Pisot sequences.
%K A020734 nonn
%O A020734 0,1
%A A020734 _David W. Wilson_