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 A294327 #12 Oct 29 2017 13:34:34 %S A294327 0,18,288,3888,48888,588888,6888888,78888888,888888888,9888888888, %T A294327 108888888888,1188888888888,12888888888888,138888888888888, %U A294327 1488888888888888,15888888888888888,168888888888888888,1788888888888888888,18888888888888888888,198888888888888888888 %N A294327 a(n) = ((9*n + 8)*10^n - 8)/9. %H A294327 Colin Barker, <a href="/A294327/b294327.txt">Table of n, a(n) for n = 0..900</a> %H A294327 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (21,-120,100). %F A294327 From _Colin Barker_, Oct 28 2017: (Start) %F A294327 G.f.: 18*x*(1 - 5*x) / ((1 - x)*(1 - 10*x)^2). %F A294327 a(n) = 21*a(n-1) - 120*a(n-2) + 100*a(n-3) for n>2. %F A294327 (End) %o A294327 (PARI) concat(0, Vec(18*x*(1 - 5*x) / ((1 - x)*(1 - 10*x)^2) + O(x^30))) \\ _Colin Barker_, Oct 28 2017 %Y A294327 Cf. A002282, A294328, A294329. %K A294327 nonn,easy %O A294327 0,2 %A A294327 _Seiichi Manyama_, Oct 28 2017