OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
Paul Leyland, Factors of Cullen and Woodall numbers
Paul Leyland, Generalized Cullen and Woodall numbers
Index entries for linear recurrences with constant coefficients, signature (13, -48, 36).
FORMULA
a(n) = 13*a(n-1) - 48*a(n-2) + 36*a(n-3); a(1)=5, a(2)=71, a(3)=647. - Harvey P. Dale, May 25 2011
G.f.: 6*x/(1-6*x)^2+x/(x-1). - Harvey P. Dale, May 25 2011
MATHEMATICA
Table[n 6^n-1, {n, 25}] (* or *) LinearRecurrence[{13, -48, 36}, {5, 71, 647}, 25] (* Harvey P. Dale, May 25 2011 *)
PROG
(Magma) [ n*6^n-1: n in [1..20]]; // Vincenzo Librandi, Sep 16 2011
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Oct 19 2001
STATUS
approved