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 A038140 #18 Feb 17 2023 17:39:15 %S A038140 0,0,0,0,0,0,0,1,5,43,283,1954,12363,76283,453946,2641506 %N A038140 Number of planar polyhexes with n cells and a single hole of size at least 2. %H A038140 Sven J. Cyvin, Jon Brunvoll, Björg N. Cyvin, John L. Bergan, and E. Brendsdal, <a href="https://doi.org/10.1007/BF00673438">The simplest coronoids: hollow hexagons</a>, Struct. Chem., 2 (1991), 555-566. %H A038140 J. V. Knop, W. R. Mueller, K. Szymanski, and N. Trinajstic, <a href="https://doi.org/10.1021/ci00066a010">Use of small computers for large computations: enumeration of polyhex hydrocarbons</a>, J. Chem. Inf. Comput. Sci., 30 (1990), 159-160. %Y A038140 Cf. A018190, A038141, A323930, A038144. %K A038140 nonn,more %O A038140 1,9 %A A038140 _N. J. A. Sloane_ %E A038140 Name clarified by _Andrey Zabolotskiy_, Feb 17 2023