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A loop through a Graph that visits each node exactly once but does not end adjacent
to the initial point. The number of Hamiltonian paths on an 
-Hypercube is 0, 0, 48, 48384, ... (Sloane's A006070,
Gardner 1986, pp. 23-24).
See also Hamiltonian Circuit, Hamiltonian Graph
References
Gardner, M.  ``The Binary Gray Code.''  In Knotted Doughnuts and Other Mathematical
  Entertainments.  New York: W. H. Freeman, pp. 23-24, 1986.
 
Sloane, N. J. A.  Sequence
A006070/M5295
in ``An On-Line Version of the Encyclopedia of Integer Sequences.''
http://www.research.att.com/~njas/sequences/eisonline.html and Sloane, N. J. A. and Plouffe, S.
The Encyclopedia of Integer Sequences.  San Diego: Academic Press, 1995.