%I
%S 0,1,1,1,1,2,2,4,3,3,1,4,7,9,2,3,0,18,14,13,10,7,1,1
%N Irregular triangle read by rows giving numbers of azulenoid isomers (see Brunvoll et al. for precise definition).
%D J. Brunvoll, S. J. Cyvin and B. N. Cyvin, Azulenoids, MATCH, No. 34, 1996, 91108.
%e Triangle begins:
%e 0
%e 1
%e 1 1
%e 1 2 2
%e 4 3 3 1
%e 4 7 9 2 3 0
%e 18 14 13 10 7 1 1
%K nonn,tabf
%O 1,6
%A _N. J. A. Sloane_, Sep 23 2006
