A174737 a(n) = a(n-1) - a(n-2), with a(0)=2, a(1)=-1.

2, -1, -3, -2, 1, 3, 2, -1, -3, -2, 1, 3, 2, -1, -3, -2, 1, 3, 2, -1, -3, -2, 1, 3, 2, -1, -3, -2, 1, 3, 2, -1, -3, -2, 1, 3, 2, -1, -3, -2, 1, 3, 2, -1, -3, -2, 1, 3, 2, -1, -3, -2, 1, 3, 2, -1, -3, -2, 1, 3, 2, -1, -3, -2, 1, 3, 2, -1, -3, -2, 1, 3, 2, -1, -3, -2

Offset

0,1

References

Rosen, Discrete Mathematics and its Applications, McGraw-Hill, 2007, p. 456, Question 1b.

Links

Table of n, a(n) for n=0..75.

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

Formula

G.f.: ( 2-3*x ) / ( 1-x+x^2 ). - R. J. Mathar, Jan 08 2011

Maple

a[0] := 2: a[1] := -1: for n from 2 to 80 do a[n] := a[n-1]-a[n-2] end do: seq(a[n], n = 0 .. 75); # Emeric Deutsch, Apr 05 2010

Crossrefs

Sequence in context: A118123 A181743 A330727 * A131756 A212620 A194859

Adjacent sequences: A174734 A174735 A174736 * A174738 A174739 A174740

Keyword

sign,easy

Author

Zachary Berger (zsb1244(AT)rit.edu), Mar 28 2010

Extensions

Typo in definition fixed by Emeric Deutsch, Apr 05 2010

Status

approved