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 A168601 #10 Jul 06 2025 10:40:01
%S A168601 1,1,13,577,65737,17553361,10704000277,14796719274961,
%T A168601 46078793355045073,320622833897384770657,4940987529761176087132381,
%U A168601 167239138427197351352909547169,12340269209872740741602975099855641
%N A168601 E.g.f. A(x) satisfies A(x) = exp( x*A(2*x)^3 ).
%F A168601 a(0) = 1; a(n) = 2^(n-1) * (n-1)! * Sum_{i, j, k, l>=0 and i+j+k+l=n-1} (n-i)/2^i * a(i) * a(j) * a(k) * a(l)/(i! * j! * k! * l!). - _Seiichi Manyama_, Jul 06 2025
%e A168601 E.g.f: A(x) = 1 + x + 13*x^2/2! + 577*x^3/3! + 65737*x^4/4! +...
%o A168601 (PARI) {a(n)=local(A=1+x+x*O(x^n)); for(i=0, n, A=exp(x*subst(A, x, 2*x)^3) ); n!*polcoeff(A, n)}
%Y A168601 Cf. A096538, A168600.
%Y A168601 Cf. A360988.
%K A168601 nonn
%O A168601 0,3
%A A168601 _Paul D. Hanna_, Dec 05 2009