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 A171211 #8 Nov 07 2019 05:26:09
%S A171211 1,8,156,5944,425286,57811000,15246040860,7918843018760,
%T A171211 8165859019876353,16781575370067304448,68855523432488884833408,
%U A171211 564547878300963670909315840,9253510119618208634494942344960
%N A171211 G.f. satisfies: A(x) = (1 + x*A(2x))^8.
%F A171211 Self-convolution 8th power of A171210 where a(n) = A171210(n+1)/2^n for n>=0.
%t A171211 m = 13; A[_] = 0; Do[A[x_] = (1 + x A[2 x])^8 + O[x]^m // Normal, {m}];
%t A171211 CoefficientList[A[x], x] (* _Jean-François Alcover_, Nov 07 2019 *)
%o A171211 (PARI) {a(n)=local(A=1+x+x*O(x^n)); for(i=0, n, A=(1+x*subst(A, x, 2*x))^8); polcoeff(A, n)}
%Y A171211 Cf. A135868, A171200-A171209, A171210.
%K A171211 nonn
%O A171211 0,2
%A A171211 _Paul D. Hanna_, Dec 05 2009