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A001525
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(3n)!/(3!n!).
(Formerly M5320)
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1
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1, 60, 10080, 3326400, 1816214400, 1482030950400, 1689515283456000, 2564684200286208000, 5001134190558105600000, 12182762888199545241600000, 36255902355281846639001600000, 129433571408356192501235712000000, 545950804200446419970212233216000000
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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MATHEMATICA
| (3#)!/(3!#!)&/@Range[15] (* From Harvey P. Dale, May 25 2011 *)
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CROSSREFS
| Contribution from Johannes W. Meijer (meijgia(AT)hotmail.com), Mar 07 2009: Equals A064350/3!, row sums of A157704/3! and row sums of A157705/3!
Sequence in context: A130214 A146498 A003750 * A146513 A145411 A184890
Adjacent sequences: A001522 A001523 A001524 * A001526 A001527 A001528
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| More terms from Harvey P. Dale, May 25 2011.
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