Number of r-bicoverings (or restricted proper 2-covers) of an n-set.
1, 0, 1, 5, 43, 518, 8186, 163356, 3988342, 116396952, 3985947805, 157783127673
5 seqfan posts
Sun Jul 3 19:02:21 CEST 2011 [seqfan] Re: help needed for number of 2-covers
Sun Jul 3 18:50:59 CEST 2011 [seqfan] Re: help needed for number of 2-covers
Sun Jul 3 18:28:54 CEST 2011 [seqfan] Re: help needed for number of 2-covers
Sun Jul 3 17:46:21 CEST 2011 [seqfan] Re: help needed for number of 2-covers
Sun Jul 3 17:15:22 CEST 2011 [seqfan] Re: help needed for number of 2-covers
Index of A-numbers in seqfan: by ascending order
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