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A013712 a(n) = 7^(2*n + 1). 2
7, 343, 16807, 823543, 40353607, 1977326743, 96889010407, 4747561509943, 232630513987207, 11398895185373143, 558545864083284007, 27368747340080916343, 1341068619663964900807, 65712362363534280139543, 3219905755813179726837607 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..150

Tanya Khovanova, Recursive Sequences

Index entries for linear recurrences with constant coefficients, signature (49).

FORMULA

From Philippe Deléham, Nov 24 2008: (Start)

a(n) = 49*a(n-1); a(0)=7.

G.f.: 7/(1-49*x).

a(n) = 7*A087752(n). (End)

PROG

(MAGMA) [7^(2*n+1): n in [0..20]]; // Vincenzo Librandi, May 26 2011

(PARI) a(n)=7^(2*n+1) \\ Charles R Greathouse IV, Jul 11 2016

CROSSREFS

Cf. A000420.

Sequence in context: A263220 A145252 A154024 * A109493 A193614 A194504

Adjacent sequences:  A013709 A013710 A013711 * A013713 A013714 A013715

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified November 13 17:16 EST 2018. Contains 317149 sequences. (Running on oeis4.)