A122676 - OEIS

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A122676

Number of unbranched catacondensed azulenoids with n carbon atoms and C_s symmetry.

%I #5 Nov 23 2014 17:23:58

%S 0,0,2,12,54,256,1141

%N Number of unbranched catacondensed azulenoids with n carbon atoms and C_s symmetry.

%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