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 A276272 #13 Apr 26 2023 07:07:23 %S A276272 1,1,1,4,10 %N A276272 Number of polytets with n cells, distinguishing mirror images. %C A276272 A polytet or polytetrahedron is a solid formed by joining platonic tetrahedra face to face. %H A276272 G. L. Sicherman, <a href="https://sicherman.net/polytets/">Catalogue of Polytets</a> %e A276272 a(4) = 4 because four cells can be grouped around a common edge, or have each of three attached to the fourth, or be joined in series; and the last case has distinct mirror images. %Y A276272 Cf. A119602 (number of polytetrahedra allowing edge connections as well as face connections), A038168. %K A276272 nonn,hard,more %O A276272 1,4 %A A276272 _George Sicherman_, Aug 26 2016