OFFSET
1,4
LINKS
Jean-François Alcover, Table of n, a(n) for n = 1..23
Jens M. Schmidt, Data files in graph6 format
Eric Weisstein's World of Mathematics, k-Connected Graph.
Gus Wiseman, The a(5) = 7 graphs with vertex-connectivity 2.
FORMULA
MATHEMATICA
a[1] = 0; a[2] = 0; a[3] = 1;
Array[a, 23] (* Jean-François Alcover, Jan 07 2021, after Andrew Howroyd *)
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
Name clarified and a(8)-a(11) by Jens M. Schmidt, Feb 18 2019
a(2)-a(3) corrected by Andrew Howroyd, Aug 28 2019
a(12)-a(20) from Andrew Howroyd, Sep 04 2019
STATUS
approved