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 A323795 #5 Jan 29 2019 11:47:47
%S A323795 1,1,3,8,27,82,310,1163
%N A323795 Number of non-isomorphic weight-n sets of non-overlapping sets of sets.
%C A323795 Also the number of non-isomorphic set partitions of set-systems of weight n.
%C A323795 All sets and multisets must be finite, and only the outermost may be empty.
%C A323795 The weight of an atom is 1, and the weight of a multiset is the sum of weights of its elements, counting multiplicity.
%e A323795 Non-isomorphic representatives of the a(1) = 1 through a(4) = 27 multiset partitions:
%e A323795 {{1}} {{12}} {{123}} {{1234}}
%e A323795 {{1}{2}} {{1}{12}} {{1}{123}}
%e A323795 {{1}}{{2}} {{1}{23}} {{12}{13}}
%e A323795 {{1}}{{12}} {{1}{234}}
%e A323795 {{1}}{{23}} {{12}{34}}
%e A323795 {{1}{2}{3}} {{1}}{{123}}
%e A323795 {{1}}{{2}{3}} {{1}{2}{12}}
%e A323795 {{1}}{{2}}{{3}} {{1}{2}{13}}
%e A323795 {{12}}{{13}}
%e A323795 {{1}}{{234}}
%e A323795 {{1}{2}{34}}
%e A323795 {{12}}{{34}}
%e A323795 {{1}}{{2}{12}}
%e A323795 {{12}}{{1}{2}}
%e A323795 {{1}}{{2}{13}}
%e A323795 {{12}}{{1}{3}}
%e A323795 {{1}}{{2}{34}}
%e A323795 {{1}{2}{3}{4}}
%e A323795 {{12}}{{3}{4}}
%e A323795 {{2}}{{1}{13}}
%e A323795 {{1}}{{2}}{{12}}
%e A323795 {{1}}{{2}}{{13}}
%e A323795 {{1}}{{2}}{{34}}
%e A323795 {{1}}{{2}{3}{4}}
%e A323795 {{1}{2}}{{3}{4}}
%e A323795 {{1}}{{2}}{{3}{4}}
%e A323795 {{1}}{{2}}{{3}}{{4}}
%Y A323795 Cf. A004111, A007716, A049311, A050326, A050343, A283877, A306186, A318566.
%Y A323795 Cf. A323787, A323788, A323789, A323790, A323791, A323792, A323793, A323794.
%K A323795 nonn,more
%O A323795 0,3
%A A323795 _Gus Wiseman_, Jan 28 2019