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 A158533 #8 Feb 28 2018 11:31:05
%S A158533 1,-15,313,-330,55679,-9130,243319,-191510,32684159,-4958514,
%T A158533 -59283835,32834450,1367918488907,-23531909258,-4237502707769,
%U A158533 5708376915450,108358154365632223,-1937266788836962,-9193903453338647027,822123254132465890,12552837966477699775789
%N A158533 Numerator of Bernoulli(n, -4/7).
%H A158533 Vincenzo Librandi, <a href="/A158533/b158533.txt">Table of n, a(n) for n = 0..250</a>
%t A158533 Table[Numerator[BernoulliB[n, -4/7]], {n, 0, 50}] (* _Vincenzo Librandi_, Mar 16 2014 *)
%Y A158533 For denominators see A158475.
%K A158533 sign,frac
%O A158533 0,2
%A A158533 _N. J. A. Sloane_, Nov 08 2009