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 A000942 #17 Jul 12 2020 08:23:25 %S A000942 1,1,1,3,4,12,26,77,204,624,1817,5585,17007,52803,164001,514009, %T A000942 1615044,5100324,16152134,51324864 %N A000942 Number of free planar polyenoids with n nodes. %H A000942 S. J. Cyvin, J. Brunvoll, E. Brendsdal, B. N. Cyvin and E. K. Lloyd, <a href="https://doi.org/10.1021/ci00026a012">Enumeration of polyene hydrocarbons: a complete mathematical solution</a>, J. Chem. Inf. Comput. Sci., 35 (1995) 743-751 %H A000942 S. J. Cyvin, J. Brunvoll, E. Brendsdal, B. N. Cyvin and E. K. Lloyd, <a href="/A002057/a002057.pdf">Enumeration of polyene hydrocarbons: a complete mathematical solution</a>, J. Chem. Inf. Comput. Sci., 35 (1995) 743-751. [Annotated scanned copy] %Y A000942 Cf. A197459 (where polyedges may have cycles). %K A000942 nonn,more %O A000942 1,4 %A A000942 E. K. Lloyd (E.K.Lloyd(AT)soton.ac.uk) %E A000942 More terms from _Sean A. Irvine_, Oct 12 2015