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 A072563 9*w(n) where : w(1)=w(2)=w(3)=1 w(n)=(w(n-1)*w(n-2)+(w(n-1)+w(n-2))/3) / w(n-3). 0
 9, 9, 9, 15, 23, 51, 93, 225, 429, 1059, 2039, 5055, 9753, 24201, 46713, 115935, 223799, 555459, 1072269, 2661345, 5137533, 12751251, 24615383, 61094895, 117939369, 292723209, 565081449, 1402521135, 2707467863, 6719882451 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS All terms are integers. LINKS Table of n, a(n) for n=1..30. FORMULA lim n -> infinity a(n+1)/a(n) = (1/6) * ( 7 + sqrt(21) ) = 1.93042928249263... G.f.: x(15x^5+23x^4-39x^3-45x^2+9x+9)/(-x^6+6x^4-6x^2+1). CROSSREFS Cf. A072881, A072557, A072560, A072561. Sequence in context: A277223 A144586 A141557 * A206011 A192984 A069602 Adjacent sequences: A072560 A072561 A072562 * A072564 A072565 A072566 KEYWORD nonn AUTHOR Benoit Cloitre, Aug 06 2002 STATUS approved

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Last modified September 11 01:27 EDT 2024. Contains 375813 sequences. (Running on oeis4.)