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 A117850 #74 Dec 27 2020 02:35:02 %S A117850 1,3,6,23 %N A117850 Number of hydrocarbons with n carbon atoms. %C A117850 There have been so many corrections submitted to this sequence that I suspect the author did not give a complete definition of what he is counting. I have therefore reverted the entry to its original form. - _N. J. A. Sloane_, Dec 26 2016 %Y A117850 Cf. A002986. %K A117850 nonn,more %O A117850 1,2 %A A117850 _Sergio Pimentel_, May 01 2006