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A072116
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(2n)!/(phi(2n)!)^2.
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0
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2, 6, 180, 70, 6300, 831600, 168168, 12870, 12350257920, 1496523600, 85357272, 381649434566400, 1757701400, 1328822258400, 163162002966958195200000, 601080390, 674412197580, 1621291929818474833920000, 12759640231800
(list; graph; refs; listen; history; internal format)
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