%I #5 Nov 23 2014 17:34:02
%S 1,1,3,12,58,256,1156
%N Number of catacondensed azulenoids with n carbon atoms.
%H J. Brunvoll, S. J. Cyvin and B. N. Cyvin, <a href="http://match.pmf.kg.ac.rs/content34.htm">Azulenoids</a>, MATCH, No. 34, 1996, 91-108.
%K nonn
%O 1,3
%A _N. J. A. Sloane_, Sep 23 2006