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 A006274 M5243 #22 Jul 08 2025 16:45:28 %S A006274 33,46728,102266868085272,1069559300034650646049671038948382825526728 %N A006274 First differences of A006268. %D A006274 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A006274 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 A006274 Cf. A006268, A006273, A098316. %K A006274 nonn,frac %O A006274 0,1 %A A006274 _N. J. A. Sloane_ %E A006274 Definition corrected by _N. J. A. Sloane_, May 23 2023 using a formula suggested by _R. J. Mathar_, Apr 26 2007.