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A052277
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(4n+2)!/2^(2n+1).
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6
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1, 90, 113400, 681080400, 12504636144000, 548828480360160000, 49229914688306352000000, 8094874872198213459360000000, 2252447502438386084347676160000000, 997586474354936812896742294502400000000, 669959124447288464805194190141921792000000000
(list; graph; refs; listen; history; internal format)
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