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A067950
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a(n) = number of 3-times (but not 4-times) reformable permutation of {1,...,n}.
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5
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1, 0, 1, 8, 31, 56, 219, 605, 2485, 9697, 40571
(list;
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OFFSET
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6,4
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REFERENCES
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A. M. Bersani, "Reformed permutations in Mousetrap and its generalizations", preprint MeMoMat n. 15/2005.
R. K. Guy and R. J. Nowakowski, ``Mousetrap,'' in D. Miklos, V.T. Sos and T. Szonyi, eds., Combinatorics, Paul Erdős is Eighty. Bolyai Society Math. Studies, Vol. 1, pp. 193-206, 1993.
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LINKS
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Table of n, a(n) for n=6..16.
A. M. Bersani, On the game Mousetrap.
R. K. Guy and R. J. Nowakowski, Mousetrap Amer. Math. Monthly, 101 (1994), 1007-1010.
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EXAMPLE
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a(6)=1, 165342->132564->125346->136524.
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CROSSREFS
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Cf. A007709, A007711, A007712, A055459.
Sequence in context: A304130 A305479 A302306 * A303037 A230386 A022273
Adjacent sequences: A067947 A067948 A067949 * A067951 A067952 A067953
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KEYWORD
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more,nonn
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AUTHOR
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Kok Seng Chua (chuaks(AT)ihpc.nus.edu.sg), Mar 06 2002
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EXTENSIONS
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2 more terms from Alberto M. Bersani (bersani(AT)dmmm.uniroma1.it), Feb 07 2007
One more term from Alberto M. Bersani (bersani(AT)dmmm.uniroma1.it), Feb 24 2008
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STATUS
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approved
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