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