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 A038143 #11 Feb 16 2023 14:45:29 %S A038143 0,0,0,0,0,1,5,35,200,1121,5919,30509,153187,756825,3688195 %N A038143 Hexagonal cata-condensed helicenes with n cells (non-planar cata-fused benzenoid hydrocarbons). %H A038143 J. V. Knop, K. Szymanski, Ž. Jeričević, and N. Trinajstić, <a href="http://match.pmf.kg.ac.rs/electronic_versions/Match16/match16_119-134.pdf">On the total number of polyhexes</a>, Match, No. 16 (1984), 119-134. %Y A038143 Equals A002216-A038142. Cf. A018190. %K A038143 nonn,more %O A038143 1,7 %A A038143 _N. J. A. Sloane_ %E A038143 a(12)-a(15) from _Andrey Zabolotskiy_, Feb 16 2023