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 A137983 G.f.: A(x) = 1/(1 - x*A_0(x)) where A_0(x) = 1/(1 - 2x*A_1(x)^(1/2)) such that A_{n-1}(x) = 1/(1 - 2^n*x*[A_{n}(x)]^(1/2^n)) for n>=1 with A_0(x) equal to the g.f. of A137984. 0
 1, 1, 3, 13, 71, 469, 3723, 36005, 436547, 6899269, 148118063, 4468393661, 193343082863, 12098043923845, 1095808155971903, 143385496616202557, 27027137980334917335, 7318231233568088061141, 2839533242388092176367563 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Table of n, a(n) for n=0..18. EXAMPLE See examples given in A137984. PROG (PARI) {a(n)=local(A=1+2^n*x+x*O(x^n)); for(i=0, n, A=1/(1-2^(n-i)*x*A^(1/2^(n-i))+x*O(x^n))); polcoeff(A, n)} CROSSREFS Cf. A137984. Sequence in context: A000261 A111140 A302699 * A327677 A307005 A059032 Adjacent sequences: A137980 A137981 A137982 * A137984 A137985 A137986 KEYWORD nonn AUTHOR Paul D. Hanna, Feb 27 2008 STATUS approved

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Last modified April 22 01:34 EDT 2024. Contains 371887 sequences. (Running on oeis4.)