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%I #6 Aug 15 2019 00:42:25
%S 1,2,6,12,33,83,273,937,3983,18871,103697,628245,4161652,29372754,
%T 218035754
%N Number of planar graphs with n nodes and chromatic number 2.
%F (Euler transform of A243321) - 1. - _Falk Hüffner_, May 10 2019
%K nonn
%O 2,2
%A _Keith Briggs_, Aug 10 2009
%E Added term 18871 (for n=11), _Keith Briggs_, Aug 25 2009
%E a(12)-a(16) from formula by _Falk Hüffner_, May 10 2019
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