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A270473 Expansion of (1-5*x)/(1-9*x). 2
1, 4, 36, 324, 2916, 26244, 236196, 2125764, 19131876, 172186884, 1549681956, 13947137604, 125524238436, 1129718145924, 10167463313316, 91507169819844, 823564528378596, 7412080755407364, 66708726798666276, 600378541187996484, 5403406870691968356 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Colin Barker, Table of n, a(n) for n = 0..1000

Index entries for linear recurrences with constant coefficients, signature (9).

FORMULA

G.f.: (1-5*x)/(1-9*x).

a(n) = 9*a(n-1) for n>1.

a(n) = 4*9^(n-1) for n>0.

PROG

(PARI) Vec((1-5*x)/(1-9*x) + O(x^30))

CROSSREFS

Cf. A001019 (powers of 9), A083884 (partial sums).

Cf. A067403: (1-4*x)/(1-9*x); A102518: (1-6*x)/(1-9*x).

Sequence in context: A093186 A000765 A226283 * A288269 A189334 A026334

Adjacent sequences:  A270470 A270471 A270472 * A270474 A270475 A270476

KEYWORD

nonn,easy

AUTHOR

Colin Barker, Mar 17 2016

STATUS

approved

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Last modified September 26 11:48 EDT 2020. Contains 337371 sequences. (Running on oeis4.)