A268528 - OEIS

%I #9 Apr 29 2016 18:15:44

%S 2,2,12,252,18439

%N Pointed hyper-extensional graphs whose nodes/edges are all keystones and whose nodes/edges are all disposable.

%H A. Casagrande, C. Piazza, A. Policriti, <a href="http://sets2015.cnam.fr/papers/00010001.pdf">Is hyper-extensionality preservable under deletions of graph elements?</a>, Preprint 2015.

%Y Cf. A027607.

%K nonn,more

%O 1,1

%A _N. J. A. Sloane_, Feb 17 2016