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 A174426 #6 Mar 30 2012 18:52:05 %S A174426 4,36,36,144,144,144,400,400,400,400,900,900,900,900,900,1764,1764, %T A174426 1764,1764,1764,1764,3136,3136,3136,3136,3136,3136,3136,5184,5184, %U A174426 5184,5184,5184,5184,5184,5184,8100,8100,8100,8100,8100,8100,8100,8100,8100 %N A174426 Denominator of fractions in A171676. %C A174426 (Antidiagonal writing) fractions are 3/4, 5/36,5/36, 7/144,7/144,7/144, . Numerator:A171676. Rydberg-Ritz. %F A174426 n times A035287(n+2). %K A174426 nonn,frac %O A174426 0,1 %A A174426 _Paul Curtz_, Nov 28 2010