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 A249616 #9 Nov 28 2014 22:19:05
%S A249616 0,2,2,2,3,2,4,2,4,3,2,4,3,3,4,2,4,4,4,5,2,4,4,4,5,3,5,2,4,4,4,5,3,5,
%T A249616 3,5,4,2,4,4,4,5,3,5,3,5,4,3,5,4,4,5,2,4,4,4,5,4,6,4,6,5,4,6,5,5,6,2,
%U A249616 4,4,4,5,4,6,4,6,5,4,6,5,5,6
%N A249616 Number of elements in non-singleton blocks in the n-th set partition (A231428).
%H A249616 Tilman Piesk, <a href="/A249616/b249616.txt">Table of n, a(n) for n = 0..9999</a>
%H A249616 Tilman Piesk, <a href="https://commons.wikimedia.org/wiki/File:Set_partitions_5;_list.svg">Illustrated list of the first 52 equivalence relations</a>
%H A249616 Tilman Piesk, <a href="https://en.wikiversity.org/wiki/Permutations_and_partitions_in_the_OEIS">Permutations and partitions in the OEIS</a> (Wikiversity)
%e A249616 The 6th set partition has the non-singleton blocks {1,4} and {2,3}, and they contain 4 elements. So a(6) = 4.
%Y A249616 Cf. A231428, A249615.
%K A249616 nonn
%O A249616 0,2
%A A249616 _Tilman Piesk_, Nov 02 2014