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 A320798 #5 Dec 02 2018 20:54:34 %S A320798 0,1,2,5,9,24,51,134,328,868 %N A320798 Number of non-isomorphic weight-n connected antichains of non-constant multisets with multiset density -1. %C A320798 The multiset density of a multiset partition is the sum of the numbers of distinct vertices in each part minus the number of parts minus the number of vertices. %C A320798 The weight of a multiset partition is the sum of sizes of its parts. Weight is generally not the same as number of vertices. %e A320798 Non-isomorphic representatives of the a(2) = 1 through a(6) = 24 multiset partitions: %e A320798 {{12}} {{122}} {{1122}} {{11222}} {{111222}} %e A320798 {{123}} {{1222}} {{12222}} {{112222}} %e A320798 {{1233}} {{12233}} {{112233}} %e A320798 {{1234}} {{12333}} {{122222}} %e A320798 {{13}{23}} {{12344}} {{122333}} %e A320798 {{12345}} {{123333}} %e A320798 {{12}{233}} {{123344}} %e A320798 {{13}{233}} {{123444}} %e A320798 {{14}{234}} {{123455}} %e A320798 {{123456}} %e A320798 {{112}{233}} %e A320798 {{122}{233}} %e A320798 {{12}{2333}} %e A320798 {{123}{344}} %e A320798 {{124}{344}} %e A320798 {{125}{345}} %e A320798 {{13}{2233}} %e A320798 {{13}{2333}} %e A320798 {{13}{2344}} %e A320798 {{133}{233}} %e A320798 {{14}{2344}} %e A320798 {{15}{2345}} %e A320798 {{13}{24}{34}} %e A320798 {{14}{24}{34}} %Y A320798 Cf. A007716, A007718, A286520, A304867, A319719, A319721, A321155, A321760, A322111, A322113. %K A320798 nonn,more %O A320798 1,3 %A A320798 _Gus Wiseman_, Nov 29 2018