Search: id:A002777 Results 1-1 of 1 results found. %I A002777 M3526 N1432 %S A002777 1,0,0,0,4,16,80,672,4896,49920,460032,5598720,62584320,885381120, %T A002777 11644323840,187811205120,2841958748160,51481298534400,881192033648640, %U A002777 17714783352913920,338434210452602880,7477275543168614400 %N A002777 Restricted permutations. %D A002777 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %D A002777 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence). %D A002777 T. Muir, The Theory of Determinants in the Historical Order of Development. 4 vols., Macmillan, NY, 1906-1923, Vol. 3, p. 468. %D A002777 Simpson, Todd; Permutations with unique fixed and reflected points. Ars Combin. 39 (1995), 97-108. %H A002777 T. Muir, The Theory of Determinants in the Historical Order of Development, 4 vols., Macmillan, NY, 1906-1923, Vol. 2. %F A002777 a(n) = (n-1)*a(n-1) + 2*(n-d)*a(n-e), where (d, e) = (2, 3) if n even, (1, 2) if n odd. %Y A002777 Sequence in context: A075581 A020080 A003471 this_sequence A118997 A001257 A133053 %Y A002777 Adjacent sequences: A002774 A002775 A002776 this_sequence A002778 A002779 A002780 %K A002777 nonn,easy %O A002777 0,5 %A A002777 N. J. A. Sloane (njas(AT)research.att.com). %E A002777 More terms from Larry Reeves (larryr(AT)acm.org), Sep 24 2001 Search completed in 0.001 seconds