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 A084208 #6 Jul 26 2018 18:43:43
%S A084208 1,1,-3,15,-82,484,-2992,19110,-124979,832234,-5621028,38402783,
%T A084208 -264858143,1841221687,-12886279885,90713376563,-641815393278,
%U A084208 4561172770669,-32542369727538,232992967457839
%N A084208 G.f. A(x) defined by: A(x)^8 consists entirely of integer coefficients between 1 and 8 (A083948); A(x) is the unique power series solution with A(0)=1.
%C A084208 Limit a(n)/a(n+1) --> r = -0.131401689761435 where A(r)=0.
%t A084208 kmax = 20;
%t A084208 A[x_] = Sum[a[k] x^k, {k, 0, kmax}];
%t A084208 coes = CoefficientList[A[x]^8 + O[x]^(kmax + 1), x];
%t A084208 r = {a[0] -> 1, a[1] -> 1};
%t A084208 coes = coes /. r;
%t A084208 Do[r = Flatten @ Append[r, Reduce[1 <= coes[[k]] <= 8, a[k-1], Integers] // ToRules];
%t A084208 coes = coes /. r, {k, 3, kmax + 1}];
%t A084208 Table[a[k], {k, 0, kmax}] /. r (* _Jean-François Alcover_, Jul 26 2018 *)
%Y A084208 Cf. A083948, A084202-A084207, A084209-A084212.
%K A084208 sign
%O A084208 0,3
%A A084208 _Paul D. Hanna_, May 20 2003