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 A176474 #11 Apr 21 2017 16:47:00
%S A176474 0,1,11,361,18479,1814401,220207679,43589145601,9589093113599,
%T A176474 3210079038566401,1115080757523532799,562000363888803840001,
%U A176474 285218528618534141030399,201645730563302817792000001
%N A176474 From the coefficients (times n!) of the expansion of the Sum_{k>=1} cos(x^k).
%H A176474 G. C. Greubel, <a href="/A176474/b176474.txt">Table of n, a(n) for n = 1..225</a>
%t A176474 Rest@ Union[ -Range[0, 26]! CoefficientList[ Series[ Sum[ Cos[x^n], {n, 35}], {x, 0, 27}], x]]
%o A176474 (PARI) { my(N=33, x='x+O('x^N)); v = Vec(serlaplace(-sum(k=1,N,cos(x^k)))); vector(#v\2-1, k, v[2*k+1])} \\ \\ _Joerg Arndt_, Apr 21 2017
%Y A176474 Cf. A176473, A176475.
%K A176474 nonn
%O A176474 1,3
%A A176474 _Robert G. Wilson v_, Apr 18 2010