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 A319721 #4 Sep 26 2018 16:26:44
%S A319721 1,1,4,8,24,50,148,349,1014,2717,8114
%N A319721 Number of non-isomorphic antichains of multisets of weight n.
%C A319721 In an antichain, no part is a proper submultiset of any other. The weight of an antichain is the sum of sizes of its parts. Weight is generally not the same as number of vertices.
%H A319721 Goran Kilibarda and Vladeta Jovovic, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL7/Kilibarda/kili2.pdf">Antichains of Multisets</a>, Journal of Integer Sequences, Vol. 7 (2004).
%e A319721 Non-isomorphic representatives of the a(1) = 1 through a(3) = 8 antichains:
%e A319721 1: {{1}}
%e A319721 2: {{1,1}}
%e A319721 {{1,2}}
%e A319721 {{1},{1}}
%e A319721 {{1},{2}}
%e A319721 3: {{1,1,1}}
%e A319721 {{1,2,2}}
%e A319721 {{1,2,3}}
%e A319721 {{1},{2,2}}
%e A319721 {{1},{2,3}}
%e A319721 {{1},{1},{1}}
%e A319721 {{1},{2},{2}}
%e A319721 {{1},{2},{3}}
%Y A319721 Cf. A001055, A001970, A007716, A096827, A253249, A285572, A285573, A293993, A318099, A319616-A319646, A319719.
%K A319721 nonn,more
%O A319721 0,3
%A A319721 _Gus Wiseman_, Sep 26 2018