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A097801
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(2*n)!/(n!*2^(n-1)).
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5
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2, 2, 6, 30, 210, 1890, 20790, 270270, 4054050, 68918850, 1309458150, 27498621150, 632468286450, 15811707161250, 426916093353750, 12380566707258750, 383797567925021250, 12665319741525701250, 443286190953399543750, 16401589065275783118750, 639661973545755541631250
(list; graph; refs; listen; history; internal format)
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