OFFSET
0,3
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
Index entries for linear recurrences with constant coefficients, signature (22,-121).
FORMULA
a(n) = 22*a(n-1) - 121*a(n-2), with a(0)=0, a(1)=1.
a(n) = n*11^(n-1).
G.f.: x/(1-11*x)^2.
a(n) = A003415(11^n). - Bruno Berselli, Oct 22 2013
From Amiram Eldar, Oct 28 2020: (Start)
Sum_{n>=1} 1/a(n) = 11*log(11/10).
Sum_{n>=1} (-1)^(n+1)/a(n) = 11*log(12/11). (End)
E.g.f.: x*exp(11*x). - G. C. Greubel, Jan 16 2024
MATHEMATICA
a[n_]:=n*11^(n-1); a[Range[0, 40]] (* Vladimir Joseph Stephan Orlovsky, Feb 09 2011*)
PROG
(Magma) [n*11^(n-1): n in [0..30]]; // Vincenzo Librandi, Jun 06 2011
(SageMath) [11^(n-1)*n for n in range(31)] # G. C. Greubel, Jan 16 2024
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Mar 07 2003
STATUS
approved