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A060416 a(n) = n*4^n - 1. 6
1, 3, 31, 191, 1023, 5119, 24575, 114687, 524287, 2359295, 10485759, 46137343, 201326591, 872415231, 3758096383, 16106127359, 68719476735, 292057776127, 1236950581247, 5222680231935, 21990232555519, 92358976733183 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Harry J. Smith, Table of n, a(n) for n = 0..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.

FORMULA

G.f.: (1-6*x+28*x^2-32*x^3)/((1-x)*(1-4*x)^2). [Colin Barker, Apr 22 2012]

MATHEMATICA

CoefficientList[Series[(1 - 6 x + 28 x^2 - 32 x^3)/((1 - x) (1 - 4 x)^2), {x, 0, 21}], x] (* Michael De Vlieger, Jan 04 2020 *)

PROG

(PARI) { for (n=0, 200, write("b060416.txt", n, " ", abs(n*4^n - 1)); ) } \\ Harry J. Smith, Jul 04 2009

CROSSREFS

Sequence in context: A007233 A197892 A198009 * A333368 A060425 A203242

Adjacent sequences:  A060413 A060414 A060415 * A060417 A060418 A060419

KEYWORD

nonn,easy

AUTHOR

Jason Earls, Apr 05 2001

STATUS

approved

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Last modified July 28 12:43 EDT 2021. Contains 346328 sequences. (Running on oeis4.)