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 A270768 #5 Mar 22 2016 18:53:35
%S A270768 15,82,456,2623,15717,98367,643401,4395802,31336468,232773295,
%T A270768 1799100571,14446912419,120354176611,1038736540222,9275288018740,
%U A270768 85580969753059,814958928731237,8000443830761623,80882083469431805,841236045441243662,8992982601018855952
%N A270768 Total sum of the sizes of all blocks with minimal element 5 in all set partitions of {1,2,...,n}.
%H A270768 Alois P. Heinz, <a href="/A270768/b270768.txt">Table of n, a(n) for n = 5..575</a>
%H A270768 Wikipedia, <a href="https://en.wikipedia.org/wiki/Partition_of_a_set">Partition of a set</a>
%Y A270768 Column k=5 of A270702.
%Y A270768 A diagonal of A270701.
%K A270768 nonn
%O A270768 5,1
%A A270768 _Alois P. Heinz_, Mar 22 2016