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Triangle whose (i,j)-th entry is binomial(i,j)*11^(i-j)*9^j.
0

%I #5 Mar 30 2012 16:47:46

%S 1,11,9,121,198,81,1331,3267,2673,729,14641,47916,58806,32076,6561,

%T 161051,658845,1078110,882090,360855,59049,1771561,8696754,17788815,

%U 19405980,11908215,3897234,531441,19487171,111608343,273947751

%N Triangle whose (i,j)-th entry is binomial(i,j)*11^(i-j)*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. 109-121.

%K nonn,tabl,easy

%O 0,2

%A _N. J. A. Sloane_.