OFFSET
1,1
LINKS
Harry J. Smith, Table of n, a(n) for n = 1..200
Paul Leyland, Factors of Cullen and Woodall numbers
Paul Leyland, Generalized Cullen and Woodall numbers
Amelia Carolina Sparavigna, The groupoids of Mersenne, Fermat, Cullen, Woodall and other Numbers and their representations by means of integer sequences, Politecnico di Torino, Italy (2019), [math.NT].
Amelia Carolina Sparavigna, Some Groupoids and their Representations by Means of Integer Sequences, International Journal of Sciences (2019) Vol. 8, No. 10.
Index entries for linear recurrences with constant coefficients, signature (7,-15,9).
FORMULA
G.f.: x*(2-3*x)*(1+3*x)/((1-x)*(1-3*x)^2). - Colin Barker, Apr 22 2012
a(n) = 7*a(n-1) - 15*a(n-2) + 9*a(n-3), a(1)=2, a(2)=17, a(3)=80. - Harvey P. Dale, Dec 14 2012
E.g.f.: 1 + exp(x)*(3*exp(2*x)*x - 1). - Stefano Spezia, Jan 05 2020
MATHEMATICA
Table[n*3^n-1, {n, 50}] (* Vladimir Joseph Stephan Orlovsky, May 19 2011 *)
LinearRecurrence[{7, -15, 9}, {2, 17, 80}, 50] (* Harvey P. Dale, Dec 14 2012 *)
PROG
(PARI) { for (n=1, 200, write("b060352.txt", n, " ", n*3^n - 1); ) } \\ Harry J. Smith, Jul 04 2009
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Jason Earls, Mar 31 2001
STATUS
approved