%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_.