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 A009070 #10 Apr 19 2018 17:35:47 %S A009070 3,4,5,5,6,7,8,8,9,9,10,10,11,12,12,12,12,13,13,14,15,15,15,15,15,16, %T A009070 16,16,17,17,18,18,19,20,20,20,20,20,21,21,21,21,22,23,24,24,24,24,24, %U A009070 24,24,25,25,25,25,26,26,27,27,27,28,28,28,28,29,29,30,30,30,30,30,31,32,32,32 %N A009070 Ordered sides of Pythagorean triangles. %C A009070 Sorted union of A009000, A009004, and A009012, retaining duplicates. - _Sean A. Irvine_, Apr 19 2018 %H A009070 Ron Knott, <a href="http://www.maths.surrey.ac.uk/hosted-sites/R.Knott/Pythag/pythag.html">Pythagorean Triples and Online Calculators</a> %Y A009070 Cf. A009000, A009004, A009012, A009041. %K A009070 nonn %O A009070 1,1 %A A009070 _David W. Wilson_