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Triangle whose (i,j)-th entry is binomial(i,j)*5^(i-j)*2^j.
1

%I #8 Apr 21 2017 20:13:51

%S 1,5,2,25,20,4,125,150,60,8,625,1000,600,160,16,3125,6250,5000,2000,

%T 400,32,15625,37500,37500,20000,6000,960,64,78125,218750,262500,

%U 175000,70000,16800,2240,128,390625,1250000,1750000,1400000,700000

%N Triangle whose (i,j)-th entry is binomial(i,j)*5^(i-j)*2^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 - 2*x*y). - _Ilya Gutkovskiy_, Apr 21 2017

%K nonn,tabl,easy

%O 0,2

%A _N. J. A. Sloane_.