Search: id:A079963
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%I A079963
%S A079963 1,1,1,1,2,4,7,10,14,21,34,55,86,131,200,310,485,757,1174,1815,2810,
%T A079963 4362,6778,10524,16323,25310,39260,60924,94549,146706,227599,353093,
%U A079963 547826,850005,1318859,2046257,3174775,4925699,7642389,11857510
%N A079963 Number of permutations satisfying -k<=p(i)-i<=r and p(i)-i not in I, 
               i=1..n, with k=1, r=5, I={1,2}.
%C A079963 Number of compositions (ordered partitions) of n into elements of the 
               set {1,4,5,6}.
%D A079963 D. H. Lehmer, Permutations with strongly restricted displacements. Combinatorial 
               theory and its applications, II (Proc. Colloq., Balatonfured, 1969), 
               pp. 755-770. North-Holland, Amsterdam, 1970.
%F A079963 Recurrence: a(n) = a(n-1)+a(n-4)+a(n-5)+a(n-6) G.f.: -1/(x^6+x^5+x^4+x-1)
%Y A079963 Cf. A002524-A002529, A072827, A072850-A072856, A079955-A080014.
%Y A079963 Sequence in context: A024536 A094281 A076101 this_sequence A056750 A095116 
               A027384
%Y A079963 Adjacent sequences: A079960 A079961 A079962 this_sequence A079964 A079965 
               A079966
%K A079963 nonn
%O A079963 0,5
%A A079963 Vladimir Baltic (baltic(AT)matf.bg.ac.yu), Feb 19 2003

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