OFFSET
0,2
COMMENTS
Even numbers for which the sum of "digits" base 100 is divisible by 11. - Daniel Forgues, Feb 22 2016
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..1000
Tanya Khovanova, Recursive Sequences
INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 334
Luis Manuel Rivera, Integer sequences and k-commuting permutations, arXiv preprint arXiv:1406.3081 [math.CO], 2014-2015.
Index entries for linear recurrences with constant coefficients, signature (2, -1).
FORMULA
G.f.: 22*x/(x-1)^2. - Vincenzo Librandi, Jun 10 2013
a(n) = A008593(2n). - Daniel Forgues, Feb 22 2016
From Wesley Ivan Hurt, May 19 2024: (Start)
a(n) = 22*n.
a(n) = 2*a(n-1) - a(n-2). (End)
MATHEMATICA
Range[0, 1500, 22] (* Vladimir Joseph Stephan Orlovsky, Jun 01 2011 *)
CoefficientList[Series[22 x / (x - 1)^2, {x, 0, 60}], x] (* Vincenzo Librandi, Jun 10 2013 *)
LinearRecurrence[{2, -1}, {0, 22}, 50] (* Harvey P. Dale, Aug 06 2018 *)
PROG
(PARI) a(n)=22*n \\ Charles R Greathouse IV, Oct 07 2015
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved