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A134356
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a(n) = Product_{k=1..n-1} (3k+1)!/(n+k)!.
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0
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1, 4, 42, 1008, 51480, 5353920, 1100473920, 437480709120, 330886851724800, 470053968773760000, 1241242628123282400000, 6040838558884497984000000, 53797620867616662708672000000, 871394214986903051252166758400000
(list; graph; refs; listen; history; internal format)
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