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 A122539 #9 Nov 15 2023 13:14:08 %S A122539 1,3,5,8,12,16,16,42,31,43,45,73,30,40 %N A122539 Number of benzenoids with 21 hexagons with D_(2h) symmetry and 60+2n carbons. %C A122539 The total number of carbons in 21 free hexagons is 6*21=126, but since they have to be attached (form overlapping molecules sharing edges) the sequence ends already at compounds with 86 carbons. - _R. J. Mathar_, May 02 2008 %H A122539 G. Brinkmann, G. Caporossi and P. Hansen, <a href="https://doi.org/10.1021/ci025526c">A survey and new results on computer enumeration of polyhex and fusene hydrocarbons</a>, J. Chem. Inf. Comput. Sci., vol. 43 (2003) pp. 842-851. See Table 4 column 5 on page 846. %e A122539 For n=10, there are 16 different forms of C_70H_30 of benzenoids of 21 hexagons attached along at least one edge, which each have D_(2h) planar symmetry. %K A122539 nonn,fini,full %O A122539 0,2 %A A122539 _Parthasarathy Nambi_, Sep 18 2006 %E A122539 Edited by _R. J. Mathar_, May 02 2008 %E A122539 Follow-up edits by _Andrey Zabolotskiy_, Nov 10 2023