ISOMERS OF POLYCYCLIC CONJUGATED HYDROCARBONS WITH ARBITRARY RING SIZES .2.

The numbers of C(n)H(s) isomers (#I) for completely condensed polycyclic conjugated hydrocarbons with arbitrary ring sizes are studied. Solutions for #I in the cases r = 4, n(i) = 2 and r = 4, n(i) = 0 were achieved. Here r and n(i) are used to denote the number of rings and number of internal carbons, respectively. Combinatorial methods were applied, in combination with computer programming. The present work, in supplement to the preceding part of this article series, completes the analysis of #I for all cases where r less-than-or-equal-to 4.