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 A196377 #5 Mar 30 2012 18:57:49 %S A196377 4,8,12,20,15,16,21,20,24,48,24,40,28,40,88,30,32,35,42,65,36,60,140, %T A196377 40,48,96,44,84,204,45,48,55,63,80,133,52,112,280,56,80,176,56,60,72, %U A196377 100,144,368,60,64,70,84,99,130,225,68,180,468,72,120,280,76,220 %N A196377 Positive integers b for which there is a (-4)-Pythagorean triple (a,b,c) satisfying a<=b. %C A196377 See A195770 for definitions of k-Pythagorean triple, primitive k-Pythagorean triple, and lists of related sequences. %t A196377 (See A196376.) %Y A196377 Cf. A195770, A196376, A196378, A196379, A196380. %K A196377 nonn %O A196377 1,1 %A A196377 _Clark Kimberling_, Oct 01 2011