Number of ways n couples can sit in a row without any spouses next to each other.
1, 0, 8, 240, 13824, 1263360, 168422400, 30865121280, 7445355724800
4 seqfan posts
Thu Feb 25 21:50:31 CET 2010 [seqfan] Re: Permutations avoiding a pair sum
Thu Feb 25 20:27:50 CET 2010 [seqfan] Re: Permutations avoiding a pair sum
Thu Feb 25 20:24:27 CET 2010 [seqfan] Re: Permutations avoiding a pair sum
Thu Feb 25 15:06:50 CET 2010 [seqfan] Permutations avoiding a pair sum
Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword
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