OFFSET
1,1
COMMENTS
General form: (q*n+1)*q: q=2: A016825, q=3: A017197, q=4: A119413, ... . - Vladimir Joseph Stephan Orlovsky, Feb 16 2009
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..5000
Tanya Khovanova, Recursive Sequences.
Index entries for linear recurrences with constant coefficients, signature (2,-1).
FORMULA
O.g.f.: 4*x*(1+3*x)/(1-x)^2. - R. J. Mathar, Aug 08 2008
From Elmo R. Oliveira, Apr 03 2025: (Start)
E.g.f.: 4*(exp(x)*(4*x - 3) + 3).
a(n) = 2*a(n-1) - a(n-2) for n > 2.
MATHEMATICA
Range[4, 1000, 16] (* Vladimir Joseph Stephan Orlovsky, May 31 2011 *)
PROG
(PARI) for(x=1, 100, print1(16*x-12, ", "))
(Magma) [16*n-12: n in [1..60]]; // Vincenzo Librandi, Jul 23 2011
CROSSREFS
KEYWORD
nonn,less,easy
AUTHOR
Jorge Coveiro, Jul 26 2006
STATUS
approved
