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A165747 a(n) = 1-2n. 3
1, -1, -3, -5, -7, -9, -11, -13, -15, -17, -19, -21, -23, -25, -27, -29, -31, -33, -35, -37, -39, -41, -43, -45, -47, -49, -51, -53, -55, -57, -59, -61, -63, -65, -67, -69, -71, -73, -75, -77, -79, -81, -83, -85, -87, -89, -91, -93, -95, -97, -99, -101, -103 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

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

FORMULA

a(n) = -A060747(n).

a(n) = 2*a(n-1) - a(n-2), a(0)= 1, a(1)= -1.

G.f.: (1-3x)/(1-x)^2.

a(n) = Sum_{k, 0<=k<=n} A112555(n,k)*(-2)^(n-k).

E.g.f.: (1-2*x)*exp(x). - G. C. Greubel, Apr 07 2016

MATHEMATICA

Table[1 - 2 n, {n, 0, 100}] (* G. C. Greubel, Apr 07 2016 *)

PROG

(PARI) x='x+O('x^99); Vec((1-3*x)/(1-x)^2) \\ Altug Alkan, Apr 07 2016

CROSSREFS

Cf. A060747

Sequence in context: A172100 A064679 A081874 * A053229 A157142 A247328

Adjacent sequences:  A165744 A165745 A165746 * A165748 A165749 A165750

KEYWORD

easy,sign

AUTHOR

Philippe Deléham, Sep 26 2009

STATUS

approved

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Last modified March 29 15:03 EDT 2017. Contains 284271 sequences.