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A001525 a(n) = (3n)!/(3!n!).
(Formerly M5320)
2
1, 60, 10080, 3326400, 1816214400, 1482030950400, 1689515283456000, 2564684200286208000, 5001134190558105600000, 12182762888199545241600000, 36255902355281846639001600000, 129433571408356192501235712000000, 545950804200446419970212233216000000 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
REFERENCES
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
LINKS
MATHEMATICA
Table[(3 n)!/(3! n!), {n, 20}] (* Harvey P. Dale, May 25 2011 *)
CROSSREFS
Equals A064350/3!, row sums of A157704/3! and row sums of A157705/3!.
Sequence in context: A295815 A146498 A003750 * A309996 A146513 A269883
KEYWORD
nonn
AUTHOR
EXTENSIONS
More terms from Harvey P. Dale, May 25 2011
STATUS
approved

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Last modified March 29 00:26 EDT 2024. Contains 371264 sequences. (Running on oeis4.)