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 A308032 #5 May 10 2019 06:51:53 %S A308032 1,1,1,1,1,1,2,4,8,16,32,66,143,333,838,2250,6320,18275,53925,161957, %T A308032 495898,1554159,5008758,16662249,57311722,203662894,745602490, %U A308032 2801326407,10760995574,42141768601,167955587806,680843078327,2808084199432,11793793850210,50489830489534 %N A308032 G.f. A(x) satisfies: A(x) = x + x^2 + x^3 + x^4 + x^5 * (1 + A(A(x))). %C A308032 Shifts left 5 places under COMPOSE transform. %t A308032 terms = 35; A[_] = 0; Do[A[x_] = x + x^2 + x^3 + x^4 + x^5 (1 + A[A[x]]) + O[x]^(terms + 1) // Normal, terms + 1]; Rest[CoefficientList[A[x], x]] %Y A308032 Cf. A030266, A030277, A308030, A308031. %K A308032 nonn %O A308032 1,7 %A A308032 _Ilya Gutkovskiy_, May 10 2019