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 A383974 #16 May 26 2025 00:25:58 %S A383974 1,1,2,8,27,126,557,2503,10270,37542,114926,283958,552542,866843, %T A383974 1129291,1250835,1195298,993613,720889,456329,251444,119989,49269, %U A383974 17238,5113,1257,262,46,8,1,1 %N A383974 Number of connected subsets of n edges of the icosahedron up to the 120 rotations and reflections of the icosahedron. %C A383974 Connected subsets of edges are also called "polysticks," "polyedges," and "polyforms." %C A383974 These are "free" polyforms, in that two polyforms are equivalent if one can be mapped to the other using the 120 symmetries of the icosahedron. %H A383974 Peter Kagey, <a href="/A383974/a383974.pdf">Illustration of a(3)</a>. %Y A383974 Cf. A333333 (cube, row 3), A383490 (dodecahedron), A383973 (octahedron, row 3), A383975 (tetrahedron, row 3). %K A383974 nonn,fini,full %O A383974 0,3 %A A383974 _Peter Kagey_, May 16 2025 %E A383974 a(11)-a(30) from _Bert Dobbelaere_, May 25 2025