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

Author

Felix Fröhlich, Jul 09 2021

Keywords

• nonn
• easy

Links

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

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).

Programs

PARI

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

Formula

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

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