login
Triangle whose (i,j)-th entry is binomial(i,j)*3^(i-j)*10^j.
0

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

%S 1,3,10,9,60,100,27,270,900,1000,81,1080,5400,12000,10000,243,4050,

%T 27000,90000,150000,100000,729,14580,121500,540000,1350000,1800000,

%U 1000000,2187,51030,510300,2835000,9450000,18900000,21000000,10000000

%N Triangle whose (i,j)-th entry is binomial(i,j)*3^(i-j)*10^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.

%e 1; 3,10; 9,60,100; 27,270,900,1000; 81,1080,5400,12000,10000; ...

%K nonn,tabl,easy

%O 0,2

%A _N. J. A. Sloane_.