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 A270767 #5 Mar 22 2016 18:31:35
%S A270767 5,25,127,670,3702,21485,131007,838485,5624233,39465366,289162042,
%T A270767 2208190845,17544083557,144774580209,1238893540107,10977721223490,
%U A270767 100583317230394,951731543130505,9288688865151775,93402218357061709,966643007728282629,10286173737875876050
%N A270767 Total sum of the sizes of all blocks with minimal element 4 in all set partitions of {1,2,...,n}.
%H A270767 Alois P. Heinz, <a href="/A270767/b270767.txt">Table of n, a(n) for n = 4..575</a>
%H A270767 Wikipedia, <a href="https://en.wikipedia.org/wiki/Partition_of_a_set">Partition of a set</a>
%Y A270767 Column k=4 of A270702.
%Y A270767 A diagonal of A270701.
%K A270767 nonn
%O A270767 4,1
%A A270767 _Alois P. Heinz_, Mar 22 2016