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 A268666 #28 Nov 04 2023 13:53:24 %S A268666 1,2,8,64,646,9364,151028,2605148,46350675 %N A268666 Number of polycubes with n cells, allowing edge connections as well as face connections, identifying mirror images. %H A268666 G. L. Sicherman, <a href="https://sicherman.net/polykedge/">Catalogue of Polykedges</a>. %e A268666 a(2) = 2 because there are two ways to join two cells in the cubic grid at faces or edges. %Y A268666 Cf. A270862 (distinguishing mirror images), A038119, A000162, A030222 (2-dimensional polyplets). %Y A268666 34th row of A366766. %K A268666 nonn,more,nice,hard %O A268666 1,2 %A A268666 _George Sicherman_, Feb 10 2016 %E A268666 a(8)-a(9) from _John Mason_, Aug 04 2021