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

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

%S 1,3,12,9,72,144,27,324,1296,1728,81,1296,7776,20736,20736,243,4860,

%T 38880,155520,311040,248832,729,17496,174960,933120,2799360,4478976,

%U 2985984,2187,61236,734832,4898880,19595520,47029248,62705664

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