A346178 Expansion of (1-2*x)/(1-10*x).

1, 8, 80, 800, 8000, 80000, 800000, 8000000, 80000000, 800000000, 8000000000, 80000000000, 800000000000, 8000000000000, 80000000000000, 800000000000000, 8000000000000000, 80000000000000000, 800000000000000000, 8000000000000000000, 80000000000000000000

Offset

0,2

Links

Paolo Xausa, Table of n, a(n) for n = 0..1000

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

Formula

a(n) = 8*10^(n-1), n>0.

E.g.f.: (1 + 4*exp(10*x))/5. - Stefano Spezia, Jul 09 2021

Mathematica

Join[{1}, 8*10^Range[0, 20]] (* Paolo Xausa, Jun 30 2026 *)

Prog

(PARI) Vec((1-2*x)/(1-10*x) + O(x^20))

Crossrefs

Cf. expansion of (1-k*x)/(1-10*x) A011557 (k=0), A196662 (k=3), A090019 (k=4), A093143 (k=5), A093141 (k=6), A093138 (k=7), A093136 (k=8).

Sequence in context: A155144 A299871 A136949 * A102592 A390336 A345081

Adjacent sequences: A346175 A346176 A346177 * A346179 A346180 A346181

Keyword

nonn,easy

Author

Felix Fröhlich, Jul 09 2021

Status

approved