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Triangle whose (i,j)-th entry is binomial(i,j)*12^(i-j)*3^j.
0

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

%S 1,12,3,144,72,9,1728,1296,324,27,20736,20736,7776,1296,81,248832,

%T 311040,155520,38880,4860,243,2985984,4478976,2799360,933120,174960,

%U 17496,729,35831808,62705664,47029248,19595520,4898880,734832,61236

%N Triangle whose (i,j)-th entry is binomial(i,j)*12^(i-j)*3^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_.