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 A157856 #5 Nov 21 2013 12:49:34 %S A157856 1,15,56,1665,3080,45375,166376,9718545,8833160,127944225,461568296, %T A157856 13274709555,23784791240,339933981675,1211397511016,137818710619425, %U A157856 61120313133320,865798969339725,3061200012378536,86466681946098645,152460758526595400 %N A157856 Numerator of Euler(n,8). %t A157856 Numerator[EulerE[Range[0,20],8]] (* _Harvey P. Dale_, Oct 02 2011 *) %Y A157856 For denominators see A006519. %K A157856 nonn,frac %O A157856 0,2 %A A157856 _N. J. A. Sloane_, Nov 10 2009