%I #7 Jan 19 2024 10:45:15
%S 1,9,12,81,216,144,729,2916,3888,1728,6561,34992,69984,62208,20736,
%T 59049,393660,1049760,1399680,933120,248832,531441,4251528,14171760,
%U 25194240,25194240,13436928,2985984,4782969,44641044,178564176
%N Triangle whose (i,j)-th entry is binomial(i,j)*9^(i-j)*12^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.
%t Table[Binomial[i,j]9^(i-j) 12^j,{i,0,10},{j,0,i}]//Flatten (* _Harvey P. Dale_, Jan 19 2024 *)
%K nonn,tabl,easy
%O 0,2
%A _N. J. A. Sloane_.