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 A293994 #4 Oct 21 2017 21:08:23 %S A293994 1,1,2,3,7,13,39,88,265 %N A293994 Number of unlabeled multiset clutters of weight n. %C A293994 A multiset clutter is a connected antichain of finite multisets. The weight of a multiset clutter is the sum of cardinalities (counting multiplicity) of its edges. %e A293994 Non-isomorphic representatives of the a(5) = 13 multiset clutters are: %e A293994 ((11111)), ((11112)), ((11122)), ((11123)), ((11223)), ((11234)), ((12345)), ((11)(122)), ((11)(123)), ((12)(111)), ((12)(113)), ((12)(134)), ((13)(122)). %Y A293994 Cf. A007716, A048143, A286520, A293607, A293993. %K A293994 nonn,more %O A293994 0,3 %A A293994 _Gus Wiseman_, Oct 21 2017