OFFSET
1,6
LINKS
Brendan McKay, confusion over k-connected graphs, posting to Sequence Fans Mailing List, Jul 08 2015.
Jens M. Schmidt, Data files in graph6 format
Eric Weisstein's World of Mathematics, k-Connected Graph
Eric Weisstein's World of Mathematics, Vertex Connectivity
FORMULA
EXAMPLE
The a(6) = 3 exactly-4-connected 6-node graphs are the complete graph K_6 with 1, 2, or 3 non-adjacent edges removed.
CROSSREFS
KEYWORD
nonn,more,hard
AUTHOR
EXTENSIONS
Partially edited by N. J. A. Sloane, Jul 08 2015 at the suggestion of Brendan McKay
a(8)-a(11) copied from A259862 by Andrey Zabolotskiy, Nov 20 2017
a(4)-a(5) corrected by Andrew Howroyd, Aug 28 2019
a(12) from Sean A. Irvine, Dec 12 2021
STATUS
approved