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 A177743 #7 Mar 19 2018 04:08:19 %S A177743 1,1,9,31,308,3809,63995,1152784,32319312 %N A177743 The number of strong vertex magic total labelings of the cyclic graph on 2n+1 vertices. %C A177743 Cyclic graphs on an even number of vertices do not possess strong VMTLs. %Y A177743 First column of triangle A177741. %K A177743 hard,more,nonn %O A177743 1,3 %A A177743 _Jason Kimberley_, May 17 2010