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A198694 7*4^n-1. 1
6, 27, 111, 447, 1791, 7167, 28671, 114687, 458751, 1835007, 7340031, 29360127, 117440511, 469762047, 1879048191, 7516192767, 30064771071, 120259084287, 481036337151, 1924145348607, 7696581394431, 30786325577727 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..1000

Index entries for linear recurrences with constant coefficients, signature (5,-4).

FORMULA

a(n) = 4*a(n-1)+3. a(n) = 5*a(n-1)-4*a(n-2), n>1.

G.f. ( 6-3*x ) / ( (4*x-1)*(x-1) ). - R. J. Mathar, Oct 30 2011

PROG

(MAGMA) [7*4^n-1: n in [0..30]]

CROSSREFS

Cf. A024036, A097743, A114569, A156760.

Sequence in context: A003517 A108958 A005284 * A220101 A014825 A141844

Adjacent sequences:  A198691 A198692 A198693 * A198695 A198696 A198697

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Oct 29 2011

STATUS

approved

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Last modified October 22 12:22 EDT 2018. Contains 316446 sequences. (Running on oeis4.)