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 A081859 #9 Jan 26 2020 19:57:27 %S A081859 3,5,8,7,20,12,9,28,11,16,33,48,13,36,39,20,65,15,60,44,17,24,88,51, %T A081859 85,19,52,119,57,28,104,95,21,84,133,60,140,32,105,23,120,69,96,115, %U A081859 68,25,160,36,161,75,136,207,27,204,76,175,180,40,225,135,29,152,252,189,120 %N A081859 Short leg of primitive Pythagorean triangles sorted on semiperimeter. %H A081859 Ray Chandler, <a href="/A081859/b081859.txt">Table of n, a(n) for n = 1..10000</a> %Y A081859 Cf. A020886, A020884, A046086. %K A081859 nonn %O A081859 1,1 %A A081859 _Lekraj Beedassy_, Apr 23 2003 %E A081859 More terms from _Ray Chandler_, Oct 28 2003