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 A301920 #16 Aug 27 2019 10:44:07
%S A301920 1,1,1,3,10,55,2369,14026242,29284932065996223,
%T A301920 468863491068204425232922367146585,
%U A301920 1994324729204021501147398087008429476673379600542622915802043455294332
%N A301920 Number of unlabeled uniform connected hypergraphs spanning n vertices.
%C A301920 A hypergraph is uniform if all edges have the same size.
%H A301920 Andrew Howroyd, <a href="/A301920/b301920.txt">Table of n, a(n) for n = 0..13</a>
%e A301920 Non-isomorphic representatives of the a(4) = 10 hypergraphs:
%e A301920 {{1,2,3,4}}
%e A301920 {{1,3,4},{2,3,4}}
%e A301920 {{1,3},{2,4},{3,4}}
%e A301920 {{1,4},{2,4},{3,4}}
%e A301920 {{1,2,4},{1,3,4},{2,3,4}}
%e A301920 {{1,2},{1,3},{2,4},{3,4}}
%e A301920 {{1,4},{2,3},{2,4},{3,4}}
%e A301920 {{1,3},{1,4},{2,3},{2,4},{3,4}}
%e A301920 {{1,2,3},{1,2,4},{1,3,4},{2,3,4}}
%e A301920 {{1,2},{1,3},{1,4},{2,3},{2,4},{3,4}}
%Y A301920 Row sums of A301924.
%Y A301920 Cf. A003465, A006129, A038041, A055621, A298422, A299353, A299354, A301481, A306017-A306021.
%K A301920 nonn
%O A301920 0,4
%A A301920 _Gus Wiseman_, Jun 19 2018
%E A301920 Terms a(6) and beyond from _Andrew Howroyd_, Aug 26 2019