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A304070
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Number of simple graphs with n vertices rooted at a pair of distinguished vertices.
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5
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0, 2, 8, 40, 240, 1992, 24416, 483040, 16343872, 982635280, 106979975168, 21285548190080, 7783083940331520, 5254164116114948480, 6577258363669088914432, 15332656940815954900371968, 66830735142688170751257497600, 546722015615195079134707942219904
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