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 A120734 #9 Mar 12 2021 22:24:44 %S A120734 6,30,60,84,210,210,180,630,330,924,504,1320,1386,546,1560,2340,990, %T A120734 2730,840,2574,4620,1716,1224,3570,5610,7140,4290,1710,7956,5016,7980, %U A120734 2730,10374,7854,11970,2310,6630,10920,12540,4080,11856,3036,8970,14490 %N A120734 Area of primitive Pythagorean triangles sorted on hypotenuse (A020882), then on middle side (or long leg A046087). %C A120734 Not the same as A057229. %H A120734 Michael Somos, <a href="http://grail.eecs.csuohio.edu/~somos/rtritab.txt">Table of primitive Pythagorean triples and related parameters</a> %K A120734 nonn %O A120734 1,1 %A A120734 _Lekraj Beedassy_, Aug 18 2006, Aug 20 2006