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A002634
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From discordant permutations.
(Formerly M0397 N0153)
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0
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-2, 3, 0, 25, 152, 1350, 12644, 131391, 1489568, 18329481, 243365514, 3468969962, 52848096274, 857073295427, 14744289690560, 268202790690465, 5143861702523924, 103746422699053582, 2195275169113687656, 48629604864202585247
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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3,1
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REFERENCES
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N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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FORMULA
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a(n) = b(n) - 2*b(n-1) + b(n-2) + 2*a(n-1) + 2*a(n-2) - 2*a(n-3) + a(n-4) + 4*(-1)^n where b(n) = A000183(n) and n>6. a(3)=-2, a(4)=3, a(5)=0, a(6)=25. - Sean A. Irvine, May 03 2014
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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