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A062510
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2^n + (-1)^(n+1).
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11
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0, 3, 3, 9, 15, 33, 63, 129, 255, 513, 1023, 2049, 4095, 8193, 16383, 32769, 65535, 131073, 262143, 524289, 1048575, 2097153, 4194303, 8388609, 16777215, 33554433, 67108863, 134217729, 268435455, 536870913, 1073741823, 2147483649
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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REFERENCES
| D. M. Burton, Elementary Number Theory, Allyn and Bacon, Inc. Boston, MA, 1976, p. 29.
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 0..1000
G. Everest, Y. Puri and T. Ward, Integer sequences counting periodic points, arXiv:0204173
Index to sequences with linear recurrences with constant coefficients, signature (1,2).
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FORMULA
| a(n) = 3*A001045(n). - Paul Curtz, Jan 17 2008
G.f. 3*x / ( (1+x)*(1-2*x) )
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PROG
| (PARI) for(n=0, 22, print(2^n+(-1)^(n+1)))
(MAGMA) [2^n + (-1)^(n+1): n in [0..40]]; // Vincenzo Librandi, Aug 14 2011
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CROSSREFS
| Sequence in context: A197462 A105423 A147471 * A000200 A100744 A089892
Adjacent sequences: A062507 A062508 A062509 * A062511 A062512 A062513
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KEYWORD
| easy,nonn
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AUTHOR
| Jason Earls (zevi_35711(AT)yahoo.com), Jun 24 2001
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EXTENSIONS
| More terms from Larry Reeves (larryr(AT)acm.org), Jul 06 2001
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