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 A089549 #9 Jan 25 2020 12:52:34 %S A089549 45,247,459,825,1887,1653,2091,4453,4717,5395,6955,8415,10965,10147, %T A089549 12193,12423,14577,18139,20383,22125,23635,24795,31141,36381,35209, %U A089549 40309,41919,46435,44719,53703,60409,62935,59385,56953,68013,74787 %N A089549 Semiperimeter of primitive Pythagorean triangles having legs that add up to a square, sorted on hypotenuse. %H A089549 Ray Chandler, <a href="/A089549/b089549.txt">Table of n, a(n) for n = 1..10000</a> %Y A089549 Cf. A088319, A088515, A088516, A088546, A089545-A089552, A089554-A089558. %K A089549 nonn %O A089549 1,1 %A A089549 _Ray Chandler_, Nov 16 2003