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 A211604 #15 Feb 18 2013 13:12:13 %S A211604 1,1,2,6,26,186,3138,206850,91058098,534571085778,126075037515248882, %T A211604 6062019374259400059294162,470527304983253008023608694415844658, %U A211604 1285056632958988628362087081869760004715744193806354 %N A211604 a(n) = A073711(2^n-1) for n>=0. %C A211604 A073711(2^n) = 1 for n>=0. %C A211604 The g.f. G(x) for A073711 satisfies: G(x) = G(x^2) + x*G(x^2)^2. %C A211604 What is the rate of growth of this sequence? %Y A211604 Cf. A073711. %K A211604 nonn %O A211604 0,3 %A A211604 _Paul D. Hanna_, Feb 18 2013