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Triangle whose (i,j)-th entry is binomial(i,j)*11^(i-j)*12^j.
0

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

%S 1,11,12,121,264,144,1331,4356,4752,1728,14641,63888,104544,76032,

%T 20736,161051,878460,1916640,2090880,1140480,248832,1771561,11595672,

%U 31624560,45999360,37635840,16422912,2985984,19487171,148811124

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

%K nonn,tabl,easy

%O 0,2

%A _N. J. A. Sloane_.