%I A006393 M3367
%S A006393 1,4,9,32,132,597
%N A006393 Number of planar maps without faces of degree 1 or 2.
%D A006393 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A006393 Walsh, T. R. S.; Generating nonisomorphic maps without storing them. 
               SIAM J. Algebraic Discrete Methods 4 (1983), no. 2, 161-178.
%Y A006393 Sequence in context: A057819 A129196 A119574 this_sequence A076966 A048757 
               A054433
%Y A006393 Adjacent sequences: A006390 A006391 A006392 this_sequence A006394 A006395 
               A006396
%K A006393 nonn,more
%O A006393 2,2
%A A006393 N. J. A. Sloane (njas(AT)research.att.com).