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 A020892 #8 Jan 23 2020 17:47:46 %S A020892 2,3,4,5,5,6,7,7,8,9,9,10,11,11,12,13,13,14,14,15,15,16,17,17,18,18, %T A020892 19,19,20,21,21,21,22,22,23,23,24,24,25,25,26,26,27,27,28,29,29,30,30, %U A020892 30,31,31,32,33,33,33,33,34,34,35,35,36,37,37,38,38,39,39,39,39,40,41,41,42,42 %N A020892 Ordered set of (c + a - b)/2 as (a,b,c) runs through all primitive Pythagorean triples with a<b<c. %H A020892 Ray Chandler, <a href="/A020892/b020892.txt">Table of n, a(n) for n = 1..10000</a> %F A020892 a(n) = A020891(n)/2. %Y A020892 Cf. A020891. %K A020892 nonn %O A020892 1,1 %A A020892 _Clark Kimberling_ %E A020892 Offset corrected to 1 by _Ray Chandler_, Jan 23 2020