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 A306007 #4 Jun 18 2018 08:58:37
%S A306007 1,1,1,1,2,2,6,6,14,22
%N A306007 Number of non-isomorphic intersecting antichains of weight n.
%C A306007 An intersecting antichain S is a finite set of finite nonempty sets (edges), any two of which have a nonempty intersection, and none of which is a subset of any other. The weight of S is the sum of cardinalities of its elements. Weight is generally not the same as number of vertices.
%e A306007 Non-isomorphic representatives of the a(8) = 14 set-systems:
%e A306007 {{1,2,3,4,5,6,7,8}}
%e A306007 {{1,7},{2,3,4,5,6,7}}
%e A306007 {{1,2,7},{3,4,5,6,7}}
%e A306007 {{1,5,6},{2,3,4,5,6}}
%e A306007 {{1,2,3,7},{4,5,6,7}}
%e A306007 {{1,2,5,6},{3,4,5,6}}
%e A306007 {{1,3,4,5},{2,3,4,5}}
%e A306007 {{1,2},{1,3,4},{2,3,4}}
%e A306007 {{1,4},{1,5},{2,3,4,5}}
%e A306007 {{1,5},{2,4,5},{3,4,5}}
%e A306007 {{1,6},{2,6},{3,4,5,6}}
%e A306007 {{1,6},{2,3,6},{4,5,6}}
%e A306007 {{2,4},{1,2,5},{3,4,5}}
%e A306007 {{1,5},{2,5},{3,5},{4,5}}
%Y A306007 Cf. A007411, A007716, A034691, A048143, A049311, A116540, A283877, A293606, A293607, A304867, A305999, A305854-A305857, A306005-A306008.
%K A306007 nonn,more
%O A306007 0,5
%A A306007 _Gus Wiseman_, Jun 16 2018