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 A318532 #5 Aug 29 2018 16:49:30
%S A318532 2,4,11,51,635,15591
%N A318532 Number of finite sets of set partitions of {1,...,n} such that any two have meet {{1},...,{n}} and join {{1,...,n}}.
%e A318532 The a(3) = 11 sets of set partitions:
%e A318532 0
%e A318532 {{1,2,3}}
%e A318532 {{1,3},{2}}
%e A318532 {{1,2},{3}}
%e A318532 {{1},{2,3}}
%e A318532 {{1},{2},{3}}
%e A318532 {{1,2},{3}} {{1,3},{2}}
%e A318532 {{1},{2,3}} {{1,3},{2}}
%e A318532 {{1},{2,3}} {{1,2},{3}}
%e A318532 {{1},{2},{3}} {{1,2,3}}
%e A318532 {{1},{2,3}} {{1,2},{3}} {{1,3},{2}}
%Y A318532 Cf. A000110, A000258, A008277, A059849, A060639, A096827, A181939.
%Y A318532 Cf. A318389, A318390, A318391, A318392, A318394, A318531.
%K A318532 nonn,more
%O A318532 1,1
%A A318532 _Gus Wiseman_, Aug 28 2018