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 A270862 #20 May 20 2023 08:21:35 %S A270862 1,2,9,88,1103,17570,295506,5168034,92436673 %N A270862 Number of polycubes with n cells, allowing edge connections as well as face connections, distinguishing mirror images. %D A270862 Jørgen Lou, Danish Patent 126840 (27 August 1973). %H A270862 G. L. Sicherman, <a href="https://sicherman.net/polykedge/">Catalogue of Polykedges</a>. %e A270862 a(3)=9 because there are 8 ways to join 3 cells in the cubic grid at faces or edges, identifying reflections, and one of those 8 has distinct mirror images, which makes 9. %Y A270862 Cf. A268666 (identifying mirror images), A000162, A030222 (2-dimensional polyplets). %K A270862 nonn,nice,more,hard %O A270862 1,2 %A A270862 _George Sicherman_, Mar 24 2016 %E A270862 Terms a(8) and a(9) from _Joerg Arndt_ and _Márk Péter Légrádi_, May 20 2023