Voozh

A013895

a(n) = 20^(5*n + 2).

400, 1280000000, 4096000000000000, 13107200000000000000000, 41943040000000000000000000000, 134217728000000000000000000000000000, 429496729600000000000000000000000000000000, 1374389534720000000000000000000000000000000000000

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..50

Tanya Khovanova, Recursive Sequences.

Index entries for linear recurrences with constant coefficients, signature (3200000).

FORMULA

a(n) = 3200000*a(n-1), a(0)=400. - Vincenzo Librandi, May 27 2011

G.f.: -400/(3200000*x-1). - Colin Barker, Nov 17 2015

a(n) = A009964(A016873(n)). - Wesley Ivan Hurt, Nov 17 2015

From Elmo R. Oliveira, Jul 13 2025: (Start)

E.g.f.: 400*exp(3200000*x).

a(n) = 20*A013894(n) = A013896(n)/20 = A013823(n)*A013855(n). (End)

MAPLE

A013895:=n->20^(5*n+2): seq(A013895(n), n=0..10); # Wesley Ivan Hurt, Nov 17 2015

MATHEMATICA

20^(5 Range[0, 10] + 2) (* or *) CoefficientList[Series[-400/(3200000*x - 1), {x, 0, 10}], x] (* Wesley Ivan Hurt, Nov 17 2015 *)

PROG

(Magma) [20^(5*n+2): n in [0..10]]; // Vincenzo Librandi, May 27 2011

(PARI) Vec(-400/(3200000*x-1) + O(x^10)) \\ Colin Barker, Nov 17 2015

CROSSREFS

Subsequence of A009964.

Cf. A013823, A013855, A013894, A013896, A016873.

Sequence in context: A197441 A268366 A013767 * A296904 A159890 A029705

Adjacent sequences: A013892 A013893 A013894 * A013896 A013897 A013898

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane

STATUS

approved

URL: https://oeis.org/A013895

⇱ A013895 - OEIS