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 A270765 #5 Mar 22 2016 18:12:05
%S A270765 1,4,16,67,299,1429,7307,39848,230884,1416047,9160977,62316137,
%T A270765 444424965,3314372728,25786012724,208842481687,1757367578867,
%U A270765 15337268316933,138603393210479,1295082562497364,12494759080718152,124314054484739035,1274003246005735449
%N A270765 Total sum of the sizes of all blocks with minimal element 2 in all set partitions of {1,2,...,n}.
%H A270765 Alois P. Heinz, <a href="/A270765/b270765.txt">Table of n, a(n) for n = 2..575</a>
%H A270765 Wikipedia, <a href="https://en.wikipedia.org/wiki/Partition_of_a_set">Partition of a set</a>
%Y A270765 Column k=2 of A270702.
%Y A270765 A diagonal of A270701.
%K A270765 nonn
%O A270765 2,2
%A A270765 _Alois P. Heinz_, Mar 22 2016