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 A327899 #6 Oct 01 2019 09:48:34
%S A327899 1,1,1,1,2,1,2,1,6,3,2,1,63,1,2,317,657,1,4333,1,9609
%N A327899 Number of set partitions of {1..n} with equal block sizes and equal block sums.
%H A327899 Gus Wiseman, <a href="/A038041/a038041.txt">Sequences counting and ranking multiset partitions whose part lengths, sums, or averages are constant or strict.</a>
%e A327899 The a(8) = 6 set partitions:
%e A327899 {{1,2,3,4,5,6,7,8}}
%e A327899 {{1,2,7,8},{3,4,5,6}}
%e A327899 {{1,3,6,8},{2,4,5,7}}
%e A327899 {{1,4,5,8},{2,3,6,7}}
%e A327899 {{1,4,6,7},{2,3,5,8}}
%e A327899 {{1,8},{2,7},{3,6},{4,5}}
%t A327899 sps[{}]:={{}};sps[set:{i_,___}]:=Join@@Function[s,Prepend[#,s]&/@sps[Complement[set,s]]]/@Cases[Subsets[set],{i,___}];
%t A327899 Table[Length[Select[sps[Range[n]],And[SameQ@@Length/@#,SameQ@@Total/@#]&]],{n,0,8}]
%Y A327899 Set partitions with equal block-sizes are A038041.
%Y A327899 Set partitions with equal block-sums are A035470.
%Y A327899 Cf. A000110, A000258, A005651, A007837, A008277, A275780, A300335, A319189, A326512, A326513, A326515, A327908.
%K A327899 nonn,more
%O A327899 0,5
%A A327899 _Gus Wiseman_, Sep 29 2019