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 A157886 #4 Sep 21 2014 15:03:01 %S A157886 1,21,110,4599,11990,249501,1295030,107308383,138627830,2859244731, %T A157886 14712346550,604396290309,1548795089270,31691625960561, %U A157886 161831110601270,26399564969194431,16795789262584310,341432673486734991,1732778326412587190,70259641081276811619 %N A157886 Numerator of Euler(n,11). %t A157886 Numerator[EulerE[Range[0,20],11]] (* _Harvey P. Dale_, Sep 21 2014 *) %Y A157886 For denominators see A006519. %K A157886 nonn,frac %O A157886 0,2 %A A157886 _N. J. A. Sloane_, Nov 10 2009