A158388 -1 followed by infinitely many 1's.

-1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1

Offset

0,1

Comments

Up to the sign of a(0), the same as the "all ones" sequence A000012. - M. F. Hasler, May 30 2020

Links

Table of n, a(n) for n=0..104.

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

Formula

G.f.: (2x-1)/(1-x). - Philippe Deléham, Mar 19 2009

a(n) = (-1)^A000007(n) = (-1)^[n=0], where [.] is the Iverson bracket. - M. F. Hasler, May 30 2020

Mathematica

PadRight[{-1}, 120, 1] (* Harvey P. Dale, Apr 05 2023 *)

Prog

(PARI) a(n)=if(n, 1, -1) \\ Charles R Greathouse IV, Jun 13 2013
(PARI) apply( {A158388(n)=1-!n*2}, [0..90]) \\ M. F. Hasler, May 30 2020

Crossrefs

Cf. A000012, A000007.

Sequence in context: A119665 A121241 A122188 * A162285 A186035 A358766

Adjacent sequences: A158385 A158386 A158387 * A158389 A158390 A158391

Keyword

sign,mult,easy

Author

Jaroslav Krizek, Mar 17 2009

Status

approved