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A001580
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a(n) = 2^n + n^2.
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28
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1, 3, 8, 17, 32, 57, 100, 177, 320, 593, 1124, 2169, 4240, 8361, 16580, 32993, 65792, 131361, 262468, 524649, 1048976, 2097593, 4194788, 8389137, 16777792, 33555057, 67109540, 134218457, 268436240
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,2
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REFERENCES
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G. Everest, A. van der Poorten, I. Shparlinski and T. Ward, Recurrence Sequences, Amer. Math. Soc., 2003; see esp. p. 255.
P. R. Halmos, Problems for Mathematicians Young and Old. Math. Assoc. America, 1991, p. 179.
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LINKS
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FORMULA
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MATHEMATICA
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LinearRecurrence[{5, -9, 7, -2}, {1, 3, 8, 17}, 30] (* Harvey P. Dale, Jan 05 2020 *)
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PROG
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(Python)
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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