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 A228876 #3 Sep 24 2013 21:48:12 %S A228876 24,54,210,330,480,540,720,750,1344,1710,2160,8664,8970,10080,10290, %T A228876 12144,15600,18144,24570,28560,30240,34650,37044,37440,47520,52020, %U A228876 59334,68034,71604,73920,74250,80724,80730,82134,99840,107730,118320,124410,155520,169824 %N A228876 Lower Pythagorean twins. %Y A228876 Cf. A228875. %K A228876 nonn %O A228876 1,1 %A A228876 _T. D. Noe_, Sep 24 2013