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A084244 a(0)=1, a(1)=5, a(n) = -3*a(n-1), n>1. 4
1, 5, -15, 45, -135, 405, -1215, 3645, -10935, 32805, -98415, 295245, -885735, 2657205, -7971615, 23914845, -71744535, 215233605, -645700815, 1937102445, -5811307335, 17433922005, -52301766015, 156905298045, -470715894135, 1412147682405, -4236443047215 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Binomial transform is A083581.

LINKS

Table of n, a(n) for n=0..26.

Index entries for linear recurrences with constant coefficients, signature (-3).

FORMULA

a(n) = 8*0^n/3-5(-3)^n/3; G.f.: (1+8*x)/(1+3*x); E.g.f.: (8*exp(0) -5*exp(-3*x))/3.

MATHEMATICA

Join[{1}, NestList[-3#&, 5, 30]] (* Harvey P. Dale, Jan 29 2013 *)

CROSSREFS

Sequence in context: A000335 A271180 A200465 * A005030 A200664 A099235

Adjacent sequences:  A084241 A084242 A084243 * A084245 A084246 A084247

KEYWORD

easy,sign

AUTHOR

Paul Barry, May 23 2003

STATUS

approved

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Last modified October 16 19:13 EDT 2021. Contains 348043 sequences. (Running on oeis4.)