References to A002718

Number of bicoverings of an n-set.
1, 8, 80, 1088, 19232, 424400, 11361786, 361058000, 13386003873, 570886397340


1 seqfan posts

Sun Jul 3 18:50:59 CEST 2011    [seqfan] Re: help needed for number of 2-covers

Index of A-numbers in seqfan: by ascending order    by month    by frequency    by keyword
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