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 A006869 M1748 #19 Jun 15 2022 13:10:28 %S A006869 1,2,7,18,52,133,330,762,1681 %N A006869 Number of distinct vertex-degree sequences of n-faced polyhedral graphs. %D A006869 M. B. Dillencourt, personal communication. %D A006869 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A006869 Steve Dutch, <a href="https://stevedutch.net/symmetry/polynum0.htm">Enumeration of polyhedra</a> %H A006869 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Skeleton.html">Skeleton</a> %H A006869 Wikipedia, <a href="https://en.wikipedia.org/wiki/Heptahedron">Heptahedron</a> %e A006869 From _Andrey Zabolotskiy_, Jun 15 2022: (Start) %e A006869 All A000944(6) = 7 topologically distinct hexahedra have distinct vertex-degree sequences, so a(6) = 7. %e A006869 There are A000944(7) = 34 heptahedra (polyhedral graphs with 7 faces), but some of them have identical vertex-degree sequences. See Wikipedia for these a(7) = 18 vertex-degree sequences (or, equivalently by polyhedron duality, sets of faces). (End) %Y A006869 Cf. A000944. %K A006869 nonn,more %O A006869 4,2 %A A006869 _N. J. A. Sloane_ %E A006869 Name edited by _Michel Marcus_ and _Andrey Zabolotskiy_, Jun 15 2022