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 A373922 #23 Jul 02 2024 08:19:35 %S A373922 1,1,1,1,2,4,11,33,129,577,3113,19092,132318,1011665 %N A373922 Number of lattices on n unlabeled nodes, up to duality. %C A373922 Number of nonisomorphic lattices on n nodes, when from each pair of dual lattices only one is counted. %H A373922 Volker Gebhardt and Stephen Tawn, <a href="https://research-data.westernsydney.edu.au/published/ff5d9c10519311ecb15399911543e199/">Catalogue of unlabelled lattices on up to 16 elements</a>, Western Sydney University (2018). %F A373922 a(n) = (A006966(n) + A373894(n)) / 2. %e A373922 a(5)=4: These are the four lattices. The dual of the last one is not counted. %e A373922 o o o o %e A373922 | / \ /|\ | %e A373922 o o | o o o o %e A373922 | | o \|/ / \ %e A373922 o o | o o o %e A373922 | \ / \ / %e A373922 o o o %e A373922 | %e A373922 o %K A373922 nonn,hard,more %O A373922 0,5 %A A373922 _Jukka Kohonen_, Jun 30 2024