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 A002634 From discordant permutations. (Formerly M0397 N0153) 0
 -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)
 OFFSET 3,1 REFERENCES 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). LINKS 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, DOI: 10.2206/kyushumfs.10.1 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. [Annotated scanned copy] FORMULA 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 CROSSREFS Cf. A000183. Sequence in context: A318146 A088874 A256304 * A319173 A295945 A070078 Adjacent sequences:  A002631 A002632 A002633 * A002635 A002636 A002637 KEYWORD sign AUTHOR EXTENSIONS More terms from Sean A. Irvine, May 03 2014 STATUS approved

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Last modified December 5 10:45 EST 2019. Contains 329751 sequences. (Running on oeis4.)