%N Triangle whose (i,j)-th entry is binomial(i,j)*8^(i-j)*3^j.
%D B. N. Cyvin et al., Isomer enumeration of unbranched catacondensed polygonal systems with pentagons and heptagons, Match, No. 34 (Oct 1996), pp. 109-121.
%A _N. J. A. Sloane_.