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 A246058 #15 May 07 2025 00:49:47
%S A246058 1,17,177,1777,17777,177777,1777777,17777777,177777777,1777777777,
%T A246058 17777777777,177777777777,1777777777777,17777777777777,
%U A246058 177777777777777,1777777777777777,17777777777777777,177777777777777777,1777777777777777777,17777777777777777777,177777777777777777777
%N A246058 a(n) = (16*10^n - 7)/9.
%H A246058 Vincenzo Librandi, <a href="/A246058/b246058.txt">Table of n, a(n) for n = 0..100</a>
%H A246058 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (11,-10).
%F A246058 G.f.: (1+6*x)/((1-x)*(1-10*x)).
%F A246058 a(n) = 11*a(n-1) - 10*a(n-2).
%F A246058 E.g.f.: exp(x)*(16*exp(9*x) - 7)/9. - _Elmo R. Oliveira_, May 06 2025
%t A246058 Table[(16 10^n - 7)/9, {n, 0, 20}]
%o A246058 (Magma) [(16*10^n-7)/9: n in [0..20]];
%Y A246058 Cf. similar sequences listed in A246057.
%K A246058 nonn,easy
%O A246058 0,2
%A A246058 _Vincenzo Librandi_, Aug 13 2014