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A166371 a(n)=(A166351(n))^2=((6*n)!/((3*n)!))^2, n=0,1... . 0
1, 14400, 442597478400, 311283409572495360000, 1677789268237349829381980160000, 41145365786974742781838753372569600000000 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

COMMENTS

Integral representation as n-th moment of a positive function on a positive

halfaxis (solution of the Stieltjes moment problem), in Maple notation:

a(n)=int(x^n*((1/6)*BesselK(0,(1/2)*x^(1/6))/(x^(5/6)*Pi)), x=0..infinity),

n=0,1... .

This solution is not unique.

FORMULA

G.f.: sum(a(n)*x^n/(n!)^6,n=0..infinity)=hypergeom([1/6, 1/6, 1/2, 1/2, 5/6,

5/6], [1, 1, 1, 1, 1], 2985984*x).

Asymptotics: a(n)=(2-1/(18*n)+1/(1296*n^2)+247/(699840*n^3)+O(1/n^4))*

(12^n)^6/((exp(n))^6*((1/n)^n)^6), n->infinity.

CROSSREFS

Cf. A166351

Sequence in context: A190469 A203729 A144649 * A203815 A076165 A202489

Adjacent sequences:  A166368 A166369 A166370 * A166372 A166373 A166374

KEYWORD

nonn

AUTHOR

Karol A. Penson (penson(AT)lptl.jussieu.fr), Oct 13 2009

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Last modified February 16 13:42 EST 2012. Contains 205913 sequences.