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Triangle whose (i,j)-th entry is binomial(i,j)*5^(i-j)*4^j.
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%I #8 Apr 21 2017 20:15:10

%S 1,5,4,25,40,16,125,300,240,64,625,2000,2400,1280,256,3125,12500,

%T 20000,16000,6400,1024,15625,75000,150000,160000,96000,30720,4096,

%U 78125,437500,1050000,1400000,1120000,537600,143360,16384,390625

%N Triangle whose (i,j)-th entry is binomial(i,j)*5^(i-j)*4^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 - 5*x - 4*x*y). - _Ilya Gutkovskiy_, Apr 21 2017

%K nonn,tabl,easy

%O 0,2

%A _N. J. A. Sloane_.