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 A377409 #6 Nov 17 2024 21:11:26 %S A377409 1,1,1,2,4,9,23,65,197,636,2171,7756,28822,110805 %N A377409 Number of unlabeled join-semidistributive lattices with n elements. %C A377409 Equivalently, a(n) is the number of meet-semidistributive lattices with n elements. %C A377409 The smallest join-semidistributive lattice that is not meet-semidistributive has 7 elements. %Y A377409 Cf. A377408 (semidistributive lattices), A006982 (distributive lattices). %K A377409 nonn,more %O A377409 1,4 %A A377409 _Ludovic Schwob_, Oct 27 2024