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A152029
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2^n*(2*n)!/((n+1)!).
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2
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1, 2, 16, 240, 5376, 161280, 6082560, 276756480, 14760345600, 903333150720, 62412108595200, 4805732361830400, 408117579035443200, 37896632339005440000, 3819980539771748352000, 415422883700177633280000, 48482294191832495554560000, 6044126009248451112468480000
(list; graph; refs; listen; history; internal format)
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