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A199318 3*6^n+1. 1
4, 19, 109, 649, 3889, 23329, 139969, 839809, 5038849, 30233089, 181398529, 1088391169, 6530347009, 39182082049, 235092492289, 1410554953729, 8463329722369, 50779978334209, 304679870005249, 1828079220031489, 10968475320188929 (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 (7,-6).

FORMULA

a(n) = 6*a(n-1)-5.

a(n) = 7*a(n-1)-6*a(n-2).

G.f.: (4-9*x)/((1-x)*(1-6*x)).

PROG

(MAGMA) [3*6^n+1: n in [0..30]];

CROSSREFS

Sequence in context: A323620 A306183 A241840 * A117397 A004212 A243241

Adjacent sequences:  A199315 A199316 A199317 * A199319 A199320 A199321

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Nov 05 2011

STATUS

approved

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Last modified July 12 08:23 EDT 2020. Contains 335657 sequences. (Running on oeis4.)