4,1
Table of n, a(n) for n=4..11.
Eric Weisstein's World of Mathematics, Graph Minor
Eric Weisstein's World of Mathematics, Wheel Graph
Sequence in context: A108642 A250784 A250731 * A203596 A305171 A034132
Adjacent sequences: A353206 A353207 A353208 * A353210 A353211 A353212
nonn,more
Eric W. Weisstein, Apr 30 2022
approved