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 A089550 #9 Jan 25 2020 12:52:54 %S A089550 30,1729,5355,18700,101269,7714,108035,436394,481134,760695,1119755, %T A089550 1394085,3296810,781319,3999304,3598529,3770584,1904595,8214349, %U A089550 13997750,9004935,12785955,27715490,19524470,11971060,45549170,36120205 %N A089550 One sixth area of primitive Pythagorean triangles having legs that add up to a square, sorted on hypotenuse. %H A089550 Ray Chandler, <a href="/A089550/b089550.txt">Table of n, a(n) for n = 1..10000</a> %Y A089550 Cf. A088319, A088515, A088516, A088546, A089545-A089552, A089554-A089558. %K A089550 nonn %O A089550 1,1 %A A089550 _Ray Chandler_, Nov 16 2003