This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A346178 #6 Jul 15 2021 03:01:28 %S A346178 1,8,80,800,8000,80000,800000,8000000,80000000,800000000,8000000000, %T A346178 80000000000,800000000000,8000000000000,80000000000000, %U A346178 800000000000000,8000000000000000,80000000000000000,800000000000000000,8000000000000000000,80000000000000000000 %N A346178 Expansion of (1-2*x)/(1-10*x). %H A346178 <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (10). %F A346178 a(n) = 8*10^(n-1), n>0. %F A346178 E.g.f.: (1 + 4*exp(10*x))/5. - _Stefano Spezia_, Jul 09 2021 %o A346178 (PARI) Vec((1-2*x)/(1-10*x) + O(x^20)) %Y A346178 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). %K A346178 nonn,easy %O A346178 0,2 %A A346178 _Felix Fröhlich_, Jul 09 2021