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The Graph obtained by collapsing a Polyhedron into the Plane. The number of topologically distinct skeletons $N(n)$ with $n$ Vertices is given in the following table.

$n$ $N(n)$
4 1
5 2
6 7


Gardner, M. Martin Gardner's New Mathematical Diversions from Scientific American. New York: Simon and Schuster, p. 233, 1966.

© 1996-9 Eric W. Weisstein