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 A237717 #27 Feb 26 2014 14:43:40
%S A237717 2,1,1,-1,-1,1,1,-17,-1,31,5,-691,-691,5461,7,-929569,-3617,3202291,
%T A237717 43867,-221930581,-174611,4722116521,854513,-968383680827,-236364091,
%U A237717 14717667114151,8553103,-2093660879252671,-23749461029,86125672563201181
%N A237717 Numerators corresponding to A237425(n).
%C A237717 This autosequence (a sequence which has its inverse binomial transform equal to the signed sequence) is related to Bernoulli and Euler numbers. For more details, see A237425.
%H A237717 Vincenzo Librandi, <a href="/A237717/b237717.txt">Table of n, a(n) for n = 0..200</a>
%F A237717 a(2n+2) = A000367(n+1), a(2n+1) = A089171(n).
%t A237717 b[0] = 2; b[1] = 1; b[n_] := BernoulliB[n] + EulerE[n, 1]/2^IntegerExponent[n, 2]; a[n_] := Numerator[b[n]]; Table[a[n], {n, 0, 55}]
%Y A237717 Cf. A000367, A089171, A237425.
%K A237717 sign,frac
%O A237717 0,1
%A A237717 _Jean-François Alcover_ and _Paul Curtz_, Feb 24 2014