A268528 Pointed hyper-extensional graphs whose nodes/edges are all keystones and whose nodes/edges are all disposable.

2, 2, 12, 252, 18439

Offset

1,1

Links

Table of n, a(n) for n=1..5.

A. Casagrande, C. Piazza, A. Policriti, Is hyper-extensionality preservable under deletions of graph elements?, Preprint 2015.

Crossrefs

Cf. A027607.

Sequence in context: A032057 A364774 A130718 * A173331 A074477 A340587

Adjacent sequences: A268525 A268526 A268527 * A268529 A268530 A268531

Keyword

nonn,more

Author

N. J. A. Sloane, Feb 17 2016

Status

approved