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A155601 10^n-2^n+1^n 26
1, 9, 97, 993, 9985, 99969, 999937, 9999873, 99999745, 999999489, 9999998977, 99999997953, 999999995905, 9999999991809, 99999999983617, 999999999967233, 9999999999934465, 99999999999868929, 999999999999737857 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..18.

Index entries for linear recurrences with constant coefficients, signature (13,-32,20).

FORMULA

G.f.: 1/(1-10*x)-1/(1-2*x)+1/(1-x). E.g.f.: e^(10*x)-e^(2*x)+e^x.

a(n)=12*a(n-1)-20*a(n-2)+9 with a(0)=1, a(1)=9 - Vincenzo Librandi, Jul 21 2010

PROG

(PARI) a(n)=10^n-2^n+1 \\ Charles R Greathouse IV, Sep 24 2015

CROSSREFS

Cf. A074501, A020515, A155588, A155590, A155592, A155593, A155594, A155596, A155597, A155598, A155599, A155600.

Sequence in context: A236672 A155699 A230620 * A241771 A180675 A083077

Adjacent sequences:  A155598 A155599 A155600 * A155602 A155603 A155604

KEYWORD

nonn,easy

AUTHOR

Mohammad K. Azarian, Jan 25 2009

STATUS

approved

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Last modified March 8 20:52 EST 2021. Contains 341953 sequences. (Running on oeis4.)