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 A109717 #13 Aug 31 2017 04:03:54
%S A109717 0,1,1,4,9,57,354,5795,141494,7866527,728952205
%N A109717 Number of unlabeled graphs with n nodes and an invertible adjacency matrix.
%t A109717 k = {}; For[i = 1, i < 8, i++, lg = ListGraphs[i] ; len = Length[lg]; k = Append[k, Length[Select[Range[len], Det[ToAdjacencyMatrix[lg[[ # ]]]] != 0 &]]]]; k
%K A109717 hard,more,nonn
%O A109717 1,4
%A A109717 _Tanya Khovanova_, Aug 17 2008
%E A109717 Terms a(8)-a(10) from _Steve Butler_, Jun 21 2013
%E A109717 Term a(11) from _Steve Butler_, Aug 21 2013