This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A038244 #10 Jul 08 2025 22:12:23 %S A038244 1,5,2,25,20,4,125,150,60,8,625,1000,600,160,16,3125,6250,5000,2000, %T A038244 400,32,15625,37500,37500,20000,6000,960,64,78125,218750,262500, %U A038244 175000,70000,16800,2240,128,390625,1250000,1750000,1400000,700000 %N A038244 Triangle whose (i,j)-th entry is binomial(i,j)*5^(i-j)*2^j. %H A038244 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 A038244 G.f.: 1/(1 - 5*x - 2*x*y). - _Ilya Gutkovskiy_, Apr 21 2017 %K A038244 nonn,tabl,easy %O A038244 0,2 %A A038244 _N. J. A. Sloane_