A006648

[franktaw at netscape.net]

 From the definition, "Number of graphs with no isolated vertices.", it 
looks like this should be a duplicate of A002494, "Number of n-node 
graphs without isolated nodes.".  However, the values are different.  
The values for A002494 match the definition.  Does anybody know what 
A006648 is?

Franklin T. Adams-Watters

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