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A001064
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a(n) = a(n-1)a(n-2) + a(n-3).
(Formerly M0859 N0328)
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1
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1, 1, 0, 1, 1, 1, 2, 3, 7, 23, 164, 3779, 619779, 2342145005, 1451612289057674, 3399886472013047316638149, 4935316984175079105557291745555191750431, 16779517449593082173916263081219908459297087421776218065830849893
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,7
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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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_Reinhard Zumkeller_, Table of n, a(n) for n = 0..22
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MATHEMATICA
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t = {1, 1, 0}; Do[AppendTo[t, t[[-1]] * t[[-2]] + t[[-3]]], {n, 3, 20}]; t (* T. D. Noe, Jun 25 2012 *)
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PROG
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(Haskell)
a001064 n = a001064_list !! n
a001064_list = 1 : 1 : 0 : zipWith (+) a001064_list
(tail $ zipWith (*) a001064_list (tail a001064_list))
-- Reinhard Zumkeller, Dec 30 2011
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CROSSREFS
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Sequence in context: A098544 A176706 A090253 * A108176 A111235 A066356
Adjacent sequences: A001061 A001062 A001063 * A001065 A001066 A001067
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane, R. K. Guy
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STATUS
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approved
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