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 A321484 #20 Nov 18 2018 15:05:58
%S A321484 1,1,1,2,3,6,9,20,35,78,141
%N A321484 Number of non-isomorphic self-dual connected multiset partitions of weight n.
%C A321484 The dual of a multiset partition has, for each vertex, one part consisting of the indices (or positions) of the parts containing that vertex, counted with multiplicity. For example, the dual of {{1,2},{2,2}} is {{1},{1,2,2}}.
%C A321484 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 A321484 Non-isomorphic representatives of the a(1) = 1 through a(6) = 9 multiset partitions:
%e A321484 {{1}} {{11}} {{111}} {{1111}} {{11111}} {{111111}}
%e A321484 {{2}{12}} {{12}{12}} {{11}{122}} {{112}{122}}
%e A321484 {{2}{122}} {{12}{122}} {{12}{1222}}
%e A321484 {{2}{1222}} {{2}{12222}}
%e A321484 {{2}{13}{23}} {{22}{1122}}
%e A321484 {{3}{3}{123}} {{12}{13}{23}}
%e A321484 {{2}{13}{233}}
%e A321484 {{3}{23}{123}}
%e A321484 {{3}{3}{1233}}
%Y A321484 Cf. A007718, A056156, A138178, A316983, A319565, A319616, A319647, A319719, A321194, A321585, A321680, A321681.
%K A321484 nonn,more
%O A321484 0,4
%A A321484 _Gus Wiseman_, Nov 16 2018