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A001459 a(n) = (5*n)!/((2*n)!*(2*n)!*n!). 2
1, 30, 3150, 420420, 62355150, 9816086280, 1605660228900, 269764879032000, 46225898052627150, 8042050347997165500, 1415997888807961859400, 251762943910387780962000, 45125969443194371927422500 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

James Spahlinger, Table of n, a(n) for n = 0..400

FORMULA

From Ilya Gutkovskiy, Feb 07 2017: (Start)

O.g.f.: 4F3(1/5,2/5,3/5,4/5; 1/2,1/2,1; 3125*x/16).

E.g.f.: 4F4(1/5,2/5,3/5,4/5; 1/2,1/2,1,1; 3125*x/16).

a(n) ~ 5^(5*n+1/2)/(4*Pi*16^n*n). (End)

MAPLE

f := n->(5*n)!/((2*n)!*(2*n)!*n!);

MATHEMATICA

Table[(5 n)!/((2 n)! (2 n)!*n!), {n, 0, 12}] (* Michael De Vlieger, Feb 07 2017 *)

CROSSREFS

Sequence in context: A108091 A036363 A230591 * A303007 A209788 A265855

Adjacent sequences:  A001456 A001457 A001458 * A001460 A001461 A001462

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified April 25 21:06 EDT 2019. Contains 322461 sequences. (Running on oeis4.)