A121951 - OEIS

%I #4 Mar 30 2012 17:25:49

%S 3,14,109,730,4918,32043,204417,1277866,7860506,47678819

%N Number of isomeric aza-benzenoids with three nitrogen atoms and n hexagons.

%D N. Trinajstich, Z. Jericevic, J. V. Knop, W. R. Muller and K. Szymanski, "Computer generation of isomeric structures", Pure and Appl. Chem., vol. 55 (1983) pp. 379-390.

%e If n=5 then the number of isomeric aza-benzenoids with three nitrogen atoms is 4918. Here n is the number of hexagons.

%K nonn

%O 1,1

%A _Parthasarathy Nambi_, Sep 04 2006