A090019 a(n) = (3*10^n + 2*0^n)/5.

1, 6, 60, 600, 6000, 60000, 600000, 6000000, 60000000, 600000000, 6000000000, 60000000000, 600000000000, 6000000000000, 60000000000000, 600000000000000, 6000000000000000, 60000000000000000, 600000000000000000

Offset

0,2

Comments

Fifth column of triangle A067410.

Links

Table of n, a(n) for n=0..18.

Index entries for linear recurrences with constant coefficients, signature (10).

Formula

G.f.: (1-4x)/(1-10x).

E.g.f.: (3*exp(10x)+2)/5 = exp(5x)(cosh(5x)+sinh(5x)/5).

Mathematica

Join[{1}, NestList[10#&, 6, 20]] (* Harvey P. Dale, Apr 02 2015 *)

Crossrefs

Sequence in context: A136930 A136936 A136893 * A186676 A322441 A186674

Adjacent sequences: A090016 A090017 A090018 * A090020 A090021 A090022

Keyword

easy,nonn

Author

Paul Barry, Nov 20 2003

Status

approved