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 A157233 #2 Mar 30 2012 16:51:16 %S A157233 1,-9,-115,4563,103385,-7273809,-244682395,24273348363,1087614676145, %T A157233 -138831344004249,-7774941663643075,1213102349164829763, %U A157233 81523593055504608905,-15032750772611708561889,-1178611204087999571493355,250769133987648650402960763,22469741388306099177659661665 %N A157233 Numerator of Euler(n, 5/28). %Y A157233 For denominators see A009972. %K A157233 sign,frac %O A157233 0,2 %A A157233 _N. J. A. Sloane_, Nov 07 2009