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 A304196 #26 May 21 2023 08:23:55 %S A304196 1,1,2,6,21,91,484,2817,17788,116741,788081,5414701,37703459,265182187 %N A304196 Number of free tree-like polycubes of size n in three dimensions. %C A304196 A free tree-like polycube of size n in three dimensions is a face-connected set of n cells in the cubic lattice, up to translation, rotation and reflection, whose dual graph has no cycles. %H A304196 Alexandre Blondin Massé, Julien de Carufel, Alain Goupil, and Maxime Samson, <a href="https://doi.org/10.1007/978-3-319-78825-8_17">Fully-leafed tree-like polyominoes and polycubes</a>, In Combinatorial algorithms, volume 10765 of Lecture Notes of Computer Science, 28th International workshop, IWOCA 2017, Newcastle, NSW, Australia, Springer, 2018. %Y A304196 Cf. A118356 (fixed tree-like 3d-polycubes), A304198 (free tree-like 4d-polycubes), A131482 (free tree-like polyominoes). %K A304196 nonn,hard,more %O A304196 1,3 %A A304196 _Lotfi Bouallagui_, May 07 2018 %E A304196 Terms a(13) and a(14) from _Joerg Arndt_ and _Márk Péter Légrádi_, May 21 2023