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A205824 (3n)!/[3n*n!*(n+1)!] 2
1, 10, 280, 13860, 1009008, 98017920, 11972188800, 1766895530400, 306261891936000, 61040779261862400, 13761921142674432000, 3464298995338621440000, 963455812901426718720000, 293441113300834537758720000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..14.

MATHEMATICA

Table[(3n)!/(3n*n!*(n+1)!), {n, 1, 14}]

CROSSREFS

Sequence in context: A117654 A067427 A157713 * A251580 A165457 A025035

Adjacent sequences:  A205821 A205822 A205823 * A205825 A205826 A205827

KEYWORD

nonn

AUTHOR

Clark Kimberling, Feb 01 2012

STATUS

approved

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Last modified October 23 07:20 EDT 2018. Contains 316520 sequences. (Running on oeis4.)