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A155673 a(n) = 11^n+10^n-1^n. 1
1, 20, 220, 2330, 24640, 261050, 2771560, 29487170, 314358880, 3357947690, 35937424600, 385311670610, 4138428376720, 44522712143930, 479749833583240, 5177248169415650, 55949729863572160, 605447028499293770 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
FORMULA
G.f.: 1/(1-11*x)+1/(1-10*x)-1/(1-x).
E.g.f.: e^(11*x)+e^(10*x)-e^x.
a(n) = 21*a(n-1)-110*a(n-2)-90 with a(0)=1, a(1)=20. - Vincenzo Librandi, Jul 21 2010
a(n) = 22*a(n-1)-131*a(n-2)+110*a(n-3). - Wesley Ivan Hurt, May 19 2024
MATHEMATICA
Table[11^n+10^n-1, {n, 0, 20}] (* Harvey P. Dale, Feb 24 2011 *}
CROSSREFS
Sequence in context: A341371 A004411 A140354 * A000833 A302661 A178261
KEYWORD
nonn,easy
AUTHOR
Mohammad K. Azarian, Feb 01 2009
STATUS
approved

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Last modified June 16 10:42 EDT 2024. Contains 373425 sequences. (Running on oeis4.)