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A091527
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a(n) = ((3n)!/n!^2)(gamma(1+n/2)/gamma(1+3n/2)).
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1
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1, 4, 30, 256, 2310, 21504, 204204, 1966080, 19122246, 187432960, 1848483780, 18320719872, 182327718300, 1820797698048, 18236779032600, 183120225632256, 1842826521244230, 18581317012684800, 187679234340049620
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