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Erroneous version of A051504.
0

%I #1 May 16 2003 03:00:00

%S 1,1,7,137

%N Erroneous version of A051504.

%D F. Harary and E. M. Palmer, Graphical Enumeration, Academic Press, NY, 1973, p. 220.

%K dead

%O 1,3