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 A094651 #9 Feb 02 2021 19:35:29 %S A094651 1,1,1,4,20,158,1539,16970,199879,2460350,31266165,407461893, %T A094651 5420228329,73352481577,1007312969202,14008437540003,196963172193733, %U A094651 2796235114720116,40038505601111596,577693117173844307,8392528734991449808,122680472402091278920,1803416089912665770579 %N A094651 Number of unlabeled heptagonal 2-trees with n heptagons. %H A094651 Andrew Howroyd, <a href="/A094651/b094651.txt">Table of n, a(n) for n = 0..200</a> %H A094651 G. Labelle, C. Lamathe and P. Leroux, <a href="http://arXiv.org/abs/math.CO/0312424">Labeled and unlabeled enumeration of k-gonal 2-trees</a>, arXiv:math/0312424 [math.CO], Dec 23 2003. %Y A094651 Column k=7 of A340811. %Y A094651 Cf. A054581. %K A094651 nonn %O A094651 0,4 %A A094651 _Vladeta Jovovic_, Jun 06 2004 %E A094651 Terms a(20) and beyond from _Andrew Howroyd_, Feb 02 2021