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 A006270 M3170 #15 Jul 08 2025 16:45:04 %S A006270 1,3,72,439128,84722519069640072, %T A006270 608130213374088941214747405817720857404971722895128 %N A006270 Denominators of a continued fraction for (1 + sqrt(5))/2. %D A006270 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A006270 Jeffrey Shallit, <a href="http://archive.org/details/jresv80Bn2p285">Predictable regular continued cotangent expansions</a>, J. Res. Nat. Bur. Standards Sect. B 80B (1976), no. 2, 285-290. %Y A006270 For numerators see A002814. %K A006270 nonn %O A006270 0,2 %A A006270 _N. J. A. Sloane_