%I
%S 1,2,9,4,36,81,8,108,486,729,16,288,1944,5832,6561,32,720,6480,29160,
%T 65610,59049,64,1728,19440,116640,393660,708588,531441,128,4032,54432,
%U 408240,1837080,4960116,7440174,4782969,256,9216,145152
%N Triangle whose (i,j)th entry is binomial(i,j)*2^(ij)*9^j.
%D B. N. Cyvin et al., Isomer enumeration of unbranched catacondensed polygonal systems with pentagons and heptagons, Match, No. 34 (Oct 1996), pp. 109121.
%t Table[Binomial[x,y]2^(xy) 9^y,{x,0,10},{y,0,x}]//Flatten (* _Harvey P. Dale_, Jun 17 2017 *)
%K nonn,tabl,easy
%O 0,2
%A _N. J. A. Sloane_.
