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Search: id:A002633
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| A002633 |
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Related to discordant permutations.
(Formerly M2384 N0946)
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+0
1
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| 1, -3, 5, -3, 9, -3, -51, -675, -5871, -46467, -331371, -1852227, -920295, 224455293, 5571057501, 104877816093, 1781775072801, 28519837563645, 431525731169061, 5994769814117757, 68879336771960361
(list; graph; listen)
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OFFSET
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0,2
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
K. Yamamoto, Structure polynomial of Latin rectangles and its application to a combinatorial problem, Memoirs of the Faculty of Science, Kyusyu University, Series A, 10 (1956), 1-13.
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FORMULA
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a(n)-(2n-5)a(n-1)+(n-1)(n-4)a(n-2)+(n-1)(n-2)a(n-3)=0.
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MATHEMATICA
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a[ n_ ] := a[ n ]=(2n-5)a[ n-1 ]-(n-1)(n-4)a[ n-2 ]-(n-1)(n-2)a[ n-3 ]; a[ 0 ]=1; a[ 1 ]=-3; a[ 2 ]=5; Table[ s[ n ], {n, 0, 24} ]
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CROSSREFS
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Sequence in context: A100338 A094444 A099446 this_sequence A070554 A076842 A077862
Adjacent sequences: A002630 A002631 A002632 this_sequence A002634 A002635 A002636
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KEYWORD
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sign,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
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More terms from wouter.meeussen(AT)pandora.be
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