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A135575 a(n) = A135574(n+1) - 2*A135574(n). 3
0, 3, -5, 9, -16, 30, -63, 129, -257, 513, -1024, 2046, -4095, 8193, -16385, 32769, -65536, 131070, -262143, 524289, -1048577, 2097153, -4194304, 8388606, -16777215, 33554433, -67108865, 134217729, -268435456, 536870910, -1073741823, 2147483649, -4294967297, 8589934593 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..1000

Index entries for linear recurrences with constant coefficients, signature (-2,-1,-2,-1,-2).

FORMULA

G.f.: x*(3*x^3+2*x^2+x+3)/((2*x+1)*(x^2+x+1)*(x^2-x+1)). - Maksym Voznyy (voznyy(AT)mail.ru), Aug 11 2009

a(n) + 2*a(n-1) + a(n-2) + 2*a(n-3) + a(n-4) + 2*a(n-5) = 0. - G. C. Greubel, Oct 19 2016

MAPLE

A024495 := proc(n) option remember ; if n <=1 then 0 ; elif n = 2 then 1; elif n = 3 then 3 ; else A024495(n-1)-A024495(n-2)+2^(n-2) ; fi ; end: A135574 := proc(n) option remember ; A024495(2*floor(n/2)+1 - ( n mod 2)) ; end: A135575 := proc(n) A135574(n+1)-2*A135574(n) ; end: seq(A135575(n), n=0..80) ; # R. J. Mathar, Mar 31 2008

MATHEMATICA

LinearRecurrence[{-2, -1, -2, -1, -2}, {0, 3, -5, 9, -16}, 25] (* G. C. Greubel, Oct 19 2016 *)

PROG

(PARI) a(n)=([0, 1, 0, 0, 0; 0, 0, 1, 0, 0; 0, 0, 0, 1, 0; 0, 0, 0, 0, 1; -2, -1, -2, -1, -2]^n*[0; 3; -5; 9; -16])[1, 1] \\ Charles R Greathouse IV, Oct 19 2016

CROSSREFS

Sequence in context: A227233 A054180 A188223 * A306973 A130114 A143106

Adjacent sequences:  A135572 A135573 A135574 * A135576 A135577 A135578

KEYWORD

sign,easy

AUTHOR

Paul Curtz, Feb 24 2008

EXTENSIONS

More terms from R. J. Mathar, Mar 31 2008

STATUS

approved

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Last modified April 22 06:35 EDT 2019. Contains 322329 sequences. (Running on oeis4.)