OFFSET
1,1
COMMENTS
Contains only odd numbers.
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..150
Index entries for linear recurrences with constant coefficients, signature (5,0,-4).
FORMULA
G.f.: -x*(-11 + 2*x + 10*x^2) / ( (x-1)*(4*x^2 + 4*x - 1) ).
MATHEMATICA
NestList[Floor[(2+Sqrt[8])#]&, 11, 30] (* or *) LinearRecurrence[{5, 0, -4}, {11, 53, 255}, 30] (* Harvey P. Dale, Nov 18 2013 *)
PROG
(Magma) I:=[11, 53, 255]; [n le 3 select I[n] else 5*Self(n-1)-4*Self(n-3): n in [1..30]]; // Vincenzo Librandi, Oct 05 2011
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Philippe Deléham, Oct 02 2011
STATUS
approved