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

%I #6 Mar 30 2012 16:47:46

%S 1,11,11,121,242,121,1331,3993,3993,1331,14641,58564,87846,58564,

%T 14641,161051,805255,1610510,1610510,805255,161051,1771561,10629366,

%U 26573415,35431220,26573415,10629366,1771561,19487171,136410197

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