%N Number of not necessarily connected coin graphs, also known as "penny" graphs.
%C The intersection graph of unit disks which are not allowed to overlap.
%Y Cf. A085632.
%A Leah Hackman (lhackman(AT)cs.ualberta.ca), Martha Lednicky (lednicky(AT)cs.ualberta.ca), _Jim Nastos_ and _Rick L. Shepherd_, Jul 10 2003