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 (17,-80,64).
FORMULA
G.f.: x*(64*x^2 - 8*x - 7)/((x-1)*(8*x-1)^2). - Colin Barker, Oct 15 2012
a(n) = 17*a(n-1) - 80*a(n-2) + 64*a(n-3); a(1)=7, a(2)=127, a(3)=1535. - Harvey P. Dale, May 20 2013
MATHEMATICA
Table[n*8^n-1, {n, 20}] (* or *) LinearRecurrence[{17, -80, 64}, {7, 127, 1535}, 20] (* Harvey P. Dale, May 20 2013 *)
PROG
(Magma) [ n*8^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