A155622 - OEIS

A155622

a(n) = 11^n - 2^n + 1.

1, 10, 118, 1324, 14626, 161020, 1771498, 19487044, 214358626, 2357947180, 25937423578, 285311668564, 3138428372626, 34522712135740, 379749833566858, 4177248169382884, 45949729863506626, 505447028499162700

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,2

COMMENTS

In general: r^n - s^n + 1 = (r+s)*a(n-1)-(r*s)*a(n-2)+(r-1)*(s-1). - Vincenzo Librandi, Jul 21 2010

LINKS

Table of n, a(n) for n=0..17.

Index entries for linear recurrences with constant coefficients, signature (14,-35,22).

FORMULA

G.f.: 1/(1 - 11*x) - 1/(1 - 2*x) + 1/(1-x).

E.g.f.: exp(11*x) - exp(2*x) + exp(x).

a(n) = 13*a(n-1) - 22*a(n-2) + 10 for n>1, a(0)=1, a(1)=10. - Vincenzo Librandi, Jul 21 2010

MATHEMATICA

Table[11^n - 2^n + 1, {n, 0, 20}] (* or *) LinearRecurrence[{14, -35, 22}, {1, 10, 118}, 20] (* Harvey P. Dale, Oct 21 2013 *)

PROG

(PARI) a(n)=11^n-2^n+1 \\ Charles R Greathouse IV, Jun 11 2015

CROSSREFS

Cf. A155588, A155589, A155590, A155592, A155593, A155594, A155595, A155596, A155597, A155598, A155599, A155600, A155601.

Sequence in context: A262970 A309582 A367779 * A307695 A218501 A293987

Adjacent sequences: A155619 A155620 A155621 * A155623 A155624 A155625

KEYWORD

nonn,easy

AUTHOR

Mohammad K. Azarian, Jan 29 2009

STATUS

approved