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 A196381 #5 Mar 30 2012 18:57:49 %S A196381 1,13,1,11,11,37,23,73,13,47,121,59,181,23,107,83,253,1,337,61,191, %T A196381 143,433,179,541,13,71,97,299,11,661,263,793,11,431,311,37,143,193, %U A196381 587,419,479,253,767,47,13,61,611,239,683,71,23,59,397,109,359,481 %N A196381 Positive integers c for which there is a primitive (-4)-Pythagorean triple (a,b,c) satisfying a<=b. %C A196381 See A195770 for definitions of k-Pythagorean triple, primitive k-Pythagorean triple, and lists of related sequences. %t A196381 (See A196376.) %Y A196381 Cf. A195770, A196376, A196379, A196380, A196378. %K A196381 nonn %O A196381 1,2 %A A196381 _Clark Kimberling_, Oct 01 2011