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 A006272 M4883 #16 Jul 08 2025 16:45:16 %S A006272 12,2772,21624369228,10111847525912679844170507482772 %N A006272 Denominators of a continued fraction for 1 + sqrt(2). %D A006272 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A006272 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 A006272 For numerators see A006271. %K A006272 nonn %O A006272 0,1 %A A006272 _N. J. A. Sloane_