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A094047
a(n) is the number of arrangements of n couples around a round table so that each person sits between two members of the opposite sex and no couple is seated together.
+0
4
0, 0, 2, 12, 312, 9600, 416880, 23879520, 1749363840, 159591720960, 17747520940800, 2363738855385600, 371511874881100800, 68045361697964851200, 14367543450324474009600, 3464541314885011705344000
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Maintained by
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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.
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