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A175601 7*(10^n-9). 1
7, 637, 6937, 69937, 699937, 6999937, 69999937, 699999937, 6999999937, 69999999937, 699999999937, 6999999999937, 69999999999937, 699999999999937, 6999999999999937, 69999999999999937, 699999999999999937 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..100

Index entries for linear recurrences with constant coefficients, signature (11,-10).

FORMULA

G.f.: 7*x*(1 + 80*x)/((1 - x)*(1 - 10*x)). - Vincenzo Librandi, Aug 23 2014

a(n) = 11*a(n-1) - 10*a(n-2). - Vincenzo Librandi, Aug 23 2014

MATHEMATICA

CoefficientList[Series[7 (1 + 80 x)/((1 - x) (1 - 10 x)), {x, 0, 20}], x] (* Vincenzo Librandi, Aug 23 2014 *)

PROG

(MAGMA) [7*(10^n-9): n in [1..20]]; // Vincenzo Librandi, Aug 23 2014

CROSSREFS

Sequence in context: A319033 A182346 A333741 * A246113 A277839 A109542

Adjacent sequences:  A175598 A175599 A175600 * A175602 A175603 A175604

KEYWORD

nonn

AUTHOR

Vincenzo Librandi

STATUS

approved

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Last modified December 2 02:12 EST 2021. Contains 349435 sequences. (Running on oeis4.)