%I #29 Jan 10 2021 19:17:47
%S 0,0,0,0,1,3,25,378,14306,1141575,164245876,39637942895
%N Number of simple unlabeled n-node graphs of edge-connectivity 4.
%H Travis Hoppe and Anna Petrone, <a href="https://github.com/thoppe/Encyclopedia-of-Finite-Graphs">Encyclopedia of Finite Graphs</a>
%H T. Hoppe and A. Petrone, <a href="http://arxiv.org/abs/1408.3644">Integer sequence discovery from small graphs</a>, arXiv preprint arXiv:1408.3644 [math.CO], 2014.
%H Jens M. Schmidt, <a href="https://www3.tuhh.de/e11/schmidt/CombinatorialData/GraphData.html">Combinatorial data</a>.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/k-Edge-ConnectedGraph.html">k-Edge Connected Graph.</a>
%Y Column k=4 of A263296.
%Y Cf. other edge-connectivity unlabeled graph sequences A052446, A052447, A052448, A241704, A241705.
%K nonn,hard,more
%O 1,6
%A _Travis Hoppe_ and _Anna Petrone_, Apr 27 2014
%E a(11) by _Jens M. Schmidt_, Feb 18 2019
%E a(12) from _Jens M. Schmidt_'s web page, Jan 10 2021