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A156591 First differences of A154570. 3
2, -7, 6, -8, 4, -12, -4, -28, -36, -92, -164, -348, -676, -1372, -2724, -5468, -10916, -21852, -43684, -87388, -174756, -349532, -699044, -1398108, -2796196, -5592412, -11184804, -22369628, -44739236, -89478492, -178956964, -357913948, -715827876 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..1000

FORMULA

a(n)+a(n+1) = -A000079(n-1), n>0.

a(n+1) = 4*(-1)^(n+1)- A154879(n).

G.f.: (1-3*x)*(2-3*x)/((1+x)*(1-2*x)). a(n) = -2^n/6+20*(-1)^n/3, n>0. - R. J. Mathar, Feb 25 2009

CROSSREFS

Sequence in context: A210965 A189959 A158241 * A233770 A138283 A308682

Adjacent sequences:  A156588 A156589 A156590 * A156592 A156593 A156594

KEYWORD

sign,easy

AUTHOR

Paul Curtz, Feb 10 2009

EXTENSIONS

Edited by R. J. Mathar, Feb 25 2009

STATUS

approved

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Last modified May 8 18:28 EDT 2021. Contains 343666 sequences. (Running on oeis4.)