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A152832 a(0)=-2; a(n)=n-a(n-1). 13
-2, 3, -1, 4, 0, 5, 1, 6, 2, 7, 3, 8, 4, 9, 5, 10, 6, 11, 7, 12, 8, 13, 9, 14, 10, 15, 11, 16, 12, 17, 13, 18, 14, 19, 15, 20, 16, 21, 17, 22, 18, 23, 19, 24, 20, 25, 21, 26, 22, 27, 23, 28, 24, 29, 25, 30, 26, 31, 27, 32, 28, 33, 29, 34, 30, 35, 31, 36, 32, 37, 33, 38, 34, 39, 35 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..74.

FORMULA

a(n)= (n+1)/2-(9*(-1)^n+1)/4. G.f.: -(2*x-1)*(x-2)/((1+x)*(x-1)^2). a(n)=a(n-1)+a(n-2)-a(n-3). [From R. J. Mathar, Jan 03 2009, Aug 14 2009]

MATHEMATICA

lst={}; a=2; Do[a=n-a; AppendTo[lst, a], {n, 0, 6!}]; lst

CROSSREFS

Cf. A084964

Sequence in context: A253257 A127412 A304791 * A211343 A039661 A293668

Adjacent sequences:  A152829 A152830 A152831 * A152833 A152834 A152835

KEYWORD

sign

AUTHOR

Vladimir Joseph Stephan Orlovsky, Dec 14 2008

EXTENSIONS

Definition corrected by N. J. A. Sloane, Jan 11 2009

Formula adapted to offset by R. J. Mathar, Aug 14 2009

STATUS

approved

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Last modified December 10 20:55 EST 2018. Contains 318049 sequences. (Running on oeis4.)