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 A118903 #6 Feb 16 2025 08:33:01 %S A118903 12,48,60,108,120,168,192,240,300,360,420,432,480,540,588,660,672,768, %T A118903 960,972,1008,1080,1092,1200,1260,1440,1452,1500,1512,1680,1728,1848, %U A118903 1920,1980,2028,2160,2352,2448,2640,2688,2700,2772,2940,3000 %N A118903 Areas of rectangles with integer sides and diagonal. %H A118903 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PythagoreanTriple.html">Pythagorean Triple.</a> %F A118903 Twice A009112. %e A118903 12 = 3*4 and 3^2+4^2=5^2. %Y A118903 Cf. A009112, A118901, A118904, A118905. %K A118903 nonn %O A118903 1,1 %A A118903 _Giovanni Resta_, May 05 2006