A155646 -id:A155646 - cp's OEIS frontend

A155669 10^n+9^n-1.

1, 18, 180, 1728, 16560, 159048, 1531440, 14782968, 143046720, 1387420488, 13486784400, 131381059608, 1282429536480, 12541865828328, 122876792454960, 1205891132094648, 11853020188851840, 116677181699666568

Offset: 0

Mohammad K. Azarian, Feb 01 2009

Index entries for linear recurrences with constant coefficients, signature (20,-109,90).

Cf. A155646, A155647, A155648, A155649, A155650, A155651, A155652, A155653, A155654, A155655, A155656, A155657, A155658, A155659, A155660, A155661, A155662, A155663, A155664, A155665, A155666, A155667, A155668.

a(n)=10^n+9^n-1 \\ Charles R Greathouse IV, Jun 11 2015

G.f.: 1/(1-10*x)+1/(1-9*x)-1/(1-x). E.g.f.: e^(10*x)+e^(9*x)-e^x.

a(n)=19*a(n-1)-90*a(n-2)-72 with a(0)=1, a(1)=18 - Vincenzo Librandi, Jul 21 2010

A155670 11^n+9^n-1^n.

Original entry on oeis.org

1, 19, 201, 2059, 21201, 220099, 2303001, 24270139, 257405601, 2745368179, 29424209001, 316692730219, 3420857913201, 37064577972259, 402626626038201, 4383139301510299, 47802750052424001, 522124210198960339

Offset: 0

Mohammad K. Azarian, Feb 01 2009

Index entries for linear recurrences with constant coefficients, signature (21,-119,99).

A155646, A155647, A155648, A155649, A155650, A155651, A155652, A155653, A155654, A155655, A155656, A155657, A155658, A155659, A155660, A155661, A155662, A155663, A155664, A155665, A155666, A155667, A155668, A155669

Table[11^n+9^n-1^n, {n,0,30}] (* Harvey P. Dale, Mar 26 2011 *)

a(n)=11^n+9^n-1^n \\ Charles R Greathouse IV, Oct 16 2015

G.f.: 1/(1-11*x)+1/(1-9*x)-1/(1-x). E.g.f.: e^(11*x)+e^(9*x)-e^x.

a(n)=20*a(n-1)-99*a(n-2)-80 with a(0)=1, a(1)=19 - Vincenzo Librandi, Jul 21 2010

cp's OEIS Frontend

A155669 10^n+9^n-1.

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