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 A270770 #5 Mar 22 2016 19:12:42
%S A270770 203,1283,8257,54692,374718,2661473,19610565,149888167,1187718179,
%T A270770 9749390152,82822876970,727437579645,6598866824243,61763271567331,
%U A270770 595865108592205,5919787896700720,60506938062384378,635715591580580381,6859852419023278269,75965077760416135623
%N A270770 Total sum of the sizes of all blocks with minimal element 7 in all set partitions of {1,2,...,n}.
%H A270770 Alois P. Heinz, <a href="/A270770/b270770.txt">Table of n, a(n) for n = 7..575</a>
%H A270770 Wikipedia, <a href="https://en.wikipedia.org/wiki/Partition_of_a_set">Partition of a set</a>
%Y A270770 Column k=7 of A270702.
%Y A270770 A diagonal of A270701.
%K A270770 nonn
%O A270770 7,1
%A A270770 _Alois P. Heinz_, Mar 22 2016