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 A168602 G.f. satisfies: A(x) = 1 + x*A(x)^2*A(2x). 1
 1, 1, 4, 29, 348, 7078, 257400, 17567085, 2321150956, 603642816242, 311497277686152, 320223587003352866, 657101019781977963480, 2694116441965648648689708, 22080982977564915182409980400 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS EXAMPLE G.f.: A(x) = 1 + x + 4*x^2 + 29*x^3 + 348*x^4 + 7078*x^5 +... A(x)^2 = 1 + 2*x + 9*x^2 + 66*x^3 + 770*x^4 + 15084*x^5 +... PROG (PARI) {a(n)=local(A=1+x+x*O(x^n)); for(i=0, n, A=1+x*A^2*subst(A, x, 2*x) ); polcoeff(A, n)} CROSSREFS Cf. A168603. Sequence in context: A256006 A137646 A231498 * A000798 A135485 A210526 Adjacent sequences:  A168599 A168600 A168601 * A168603 A168604 A168605 KEYWORD nonn AUTHOR Paul D. Hanna, Dec 05 2009 STATUS approved

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Last modified December 13 06:26 EST 2019. Contains 329968 sequences. (Running on oeis4.)