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A081321
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(2/3)*(2*n+1)*(2*n-1)!*binomial(3*n,2*n).
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0
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6, 300, 47040, 14968800, 7991343360, 6422134118400, 7240779786240000, 10899907851216384000, 21115899915689779200000, 51167604130438090014720000, 151615591667542267763097600000, 539306547534817468755148800000000, 2267795648217238975260881584128000000
(list; graph; refs; listen; history; internal format)
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