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 A323923 #12 Feb 16 2023 16:11:07 %S A323923 0,1,7,44,206,937,3997,16719,68520,278239,1121632,4504875 %N A323923 Branched catafusenes (cata-condensed benzenoids) without helicenes, symmetry C_s. %H A323923 A. T. Balaban, J. Brunvoll, B. N. Cyvin, and S. J. Cyvin, <a href="https://doi.org/10.1016/S0040-4020(01)85110-3">Enumeration of branched catacondensed benzenoid hydrocarbons and their numbers of Kekulé structures</a>, Tetrahedron 44(1) (1988), 221-228. See Table 2. %H A323923 Björg N. Cyvin, Jon Brunvoll and Sven J. Cyvin, <a href="https://doi.org/10.1007/BFb0018563">Enumeration of benzenoid systems and other polyhexes</a>, p. 65-180 in: I. Gutman (ed.), Advances in the Theory of Benzenoid Hydrocarbons II, Springer, 1992. %Y A323923 For any symmetry, see A323851. %K A323923 nonn,more %O A323923 4,3 %A A323923 _N. J. A. Sloane_, Feb 09 2019 %E A323923 Name clarified, a(13)-a(15) from Cyvin, Brunvoll & Cyvin (Table 17) added by _Andrey Zabolotskiy_, Feb 16 2023