%I A121102
%S A121102 0,0,0,4,24,144,744,3844,19344,97344
%N A121102 Catapolyoctagons (see Cyvin et al. for precise definition).
%D A121102 S. J. Cyvin et al., Enumeration of tree-like octagonal systems: catapolyoctagons, 
               ACH Models in Chem. 134 (1997), 55-70.
%Y A121102 Sequence in context: A005319 A155119 A114169 this_sequence A067411 A045915 
               A052609
%Y A121102 Adjacent sequences: A121099 A121100 A121101 this_sequence A121103 A121104 
               A121105
%K A121102 nonn
%O A121102 1,4
%A A121102 N. J. A. Sloane (njas(AT)research.att.com), Aug 11 2006