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 A287153 #5 May 20 2017 20:08:13
%S A287153 1,2,108,90040,1441534384,423657524608288,2303329608950881340608,
%T A287153 231357371294195870227169041024,
%U A287153 429425508267098531071850722486436668160
%N A287153 Number of matchings in the graph P_2 X P_n X P_n.
%H A287153 Wikipedia, <a href="https://en.wikipedia.org/wiki/Matching_(graph_theory)">Matching (graph theory)</a>
%F A287153 a(n) = Sum_{k=0..n^2} A287152(n,k).
%Y A287153 Row sums of A287152.
%K A287153 nonn
%O A287153 0,2
%A A287153 _Alois P. Heinz_, May 20 2017