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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.)