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Triangle whose (i,j)-th entry is binomial(i,j)*6^(i-j)*3^j.
0

%I #8 Apr 21 2017 20:17:55

%S 1,6,3,36,36,9,216,324,162,27,1296,2592,1944,648,81,7776,19440,19440,

%T 9720,2430,243,46656,139968,174960,116640,43740,8748,729,279936,

%U 979776,1469664,1224720,612360,183708,30618,2187,1679616

%N Triangle whose (i,j)-th entry is binomial(i,j)*6^(i-j)*3^j.

%H B. N. Cyvin et al., <a href="http://match.pmf.kg.ac.rs/electronic_versions/Match34/match34_109-121.pdf">Isomer enumeration of unbranched catacondensed polygonal systems with pentagons and heptagons</a>, Match, No. 34 (Oct 1996), pp. 109-121.

%F G.f.: 1/(1 - 6*x - 3*x*y). - _Ilya Gutkovskiy_, Apr 21 2017

%K nonn,tabl,easy

%O 0,2

%A _N. J. A. Sloane_.