A001525 a(n) = (3n)!/(3!n!). (Formerly M5320)

1, 60, 10080, 3326400, 1816214400, 1482030950400, 1689515283456000, 2564684200286208000, 5001134190558105600000, 12182762888199545241600000, 36255902355281846639001600000, 129433571408356192501235712000000, 545950804200446419970212233216000000

Offset

1,2

References

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Links

T. D. Noe, Table of n, a(n) for n = 1..100

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 * A377667 A309996 A146513

Adjacent sequences: A001522 A001523 A001524 * A001526 A001527 A001528

Keyword

nonn

Author

N. J. A. Sloane

Extensions

More terms from Harvey P. Dale, May 25 2011

Status

approved