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 A157907 #4 Jun 21 2020 13:24:34 %S A157907 1,23,132,6049,17292,394703,2248092,204486353,290089932,6572546033, %T A157907 37162502652,1678097074579,4728061664172,106399222615163, %U A157907 597668556565212,107272376452106401,75103670464560012,1680355440510440093,9387056300571875772,419013082506039558709 %N A157907 Numerator of Euler(n,12). %t A157907 EulerE[Range[0,20],12]//Numerator (* _Harvey P. Dale_, Jun 21 2020 *) %Y A157907 For denominators see A006519. %K A157907 nonn,frac %O A157907 0,2 %A A157907 _N. J. A. Sloane_, Nov 10 2009