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 A109262 A Catalan transform of the Fibonacci numbers. 10
 0, 1, 2, 6, 19, 63, 215, 749, 2650, 9490, 34318, 125104, 459152, 1694914, 6287896, 23429158, 87635243, 328917615, 1238303243, 4674847097, 17692789741, 67114622451, 255120892105, 971649360211, 3707176155659, 14167390221873 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS A column of A109267. Hankel transform is -F(2n). a(n+1) has Hankel transform F(2n+1). - Paul Barry, Nov 22 2007 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..200 Sergio Falcon, Catalan transform of the K-Fibonacci sequence, Commun. Korean Math. Soc. 28 (2013), No. 4, pp. 827-832; http://dx.doi.org/10.4134/CKMS.2013.28.4.827. Guo-Niu Han, Enumeration of Standard Puzzles Guo-Niu Han, Enumeration of Standard Puzzles [Cached copy] FORMULA G.f.: xc(x)/(1-xc(x)-x^2c(x)^2)=(1-sqrt(1-4x))/(2(sqrt(1-4x)+x)) where c(x) is the g.f. of A000108; a(n)=sum{k=0..n, (k/(2n-k))binomial(2n-k, n-k)F(k)}. a(n)=Sum_{k, 0<=k<=n} A106566(n,k)*A000045(k). [From Philippe Deléham, Oct 28 2008] a(n)=Sum_{k, 0<=k<=n} A039599(n,k)*(-1)^(k+1)*A000045(k). [From Philippe Deléham, Oct 28 2008] Conjecture: n*a(n) +(-7*n+4)*a(n-1) +(7*n-2)*a(n-2) +(19*n-60)*a(n-3) +2*(2*n-7)*a(n-4)=0. - R. J. Mathar, Nov 26 2012 Recurrence: n*(5*n-11)*a(n) = 2*(20*n^2 - 59*n + 30)*a(n-1) - 15*(5*n^2 - 19*n + 16)*a(n-2) - 2*(2*n-5)*(5*n-6)*a(n-3). - Vaclav Kotesovec, Feb 13 2014 a(n) ~ 5*4^n/(sqrt(Pi)*n^(3/2)). - Vaclav Kotesovec, Feb 13 2014 MATHEMATICA CoefficientList[Series[(1-Sqrt[1-4*x])/(2*(Sqrt[1-4*x]+x)), {x, 0, 20}], x] (* Vaclav Kotesovec, Feb 13 2014 *) CROSSREFS Cf. A081696. Sequence in context: A284216 A059712 A059713 * A006724 A057409 A141771 Adjacent sequences:  A109259 A109260 A109261 * A109263 A109264 A109265 KEYWORD easy,nonn AUTHOR Paul Barry, Jun 24 2005 STATUS approved

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Last modified August 17 05:27 EDT 2018. Contains 313810 sequences. (Running on oeis4.)