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 A001525 (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 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 * A309996 A146513 A269883 Adjacent sequences:  A001522 A001523 A001524 * A001526 A001527 A001528 KEYWORD nonn AUTHOR EXTENSIONS More terms from Harvey P. Dale, May 25 2011. STATUS approved

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Last modified April 8 08:54 EDT 2020. Contains 333313 sequences. (Running on oeis4.)