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Triangle whose (i,j)-th entry is binomial(i,j)*9^(i-j)*2^j.
0

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

%S 1,9,2,81,36,4,729,486,108,8,6561,5832,1944,288,16,59049,65610,29160,

%T 6480,720,32,531441,708588,393660,116640,19440,1728,64,4782969,

%U 7440174,4960116,1837080,408240,54432,4032,128,43046721,76527504

%N Triangle whose (i,j)-th entry is binomial(i,j)*9^(i-j)*2^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_.