Graphs with no isolated vertices

[N. J. A. Sloane]

Frank,  Here are better descriptions:

%N A006647 Number of graphs with n nodes, n-2 edges and no isolated vertices.
%N A006648 Number of graphs with n nodes, n-1 edges and no isolated vertices.
%N A006649 Number of graphs with n nodes, n edges and no isolated vertices.
%N A006650 Number of graphs with n nodes, n+1 edges and no isolated vertices.
%N A006651 Number of graphs with n nodes, n+2 edges and no isolated vertices.


Neil