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Search: id:A001056
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| A001056 |
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a(n) = a(n-1)a(n-2) + 1.
(Formerly M2378 N0944)
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+0
2
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| 1, 3, 4, 13, 53, 690, 36571, 25233991, 922832284862, 23286741570717144243, 21489756930695820973683319349467, 500426416062641238759467086706254193219790764168482
(list; graph; listen)
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OFFSET
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0,2
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
Archimedeans Problems Drive, Eureka, 19 (1957), 13.
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LINKS
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A. V. Aho and N. J. A. Sloane, Some doubly exponential sequences, Fib. Quart., 11 (1973), 429-437.
Index entries for sequences of form a(n+1)=a(n)^2 + ...
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CROSSREFS
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Sequence in context: A036672 A084315 A062165 this_sequence A122151 A082732 A009286
Adjacent sequences: A001053 A001054 A001055 this_sequence A001057 A001058 A001059
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KEYWORD
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nonn,easy,nice
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), R. K. Guy
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