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 A098207 #16 Jul 02 2023 18:53:56 %S A098207 1,961,109561,11095561,1110955561,111109555561,11111095555561, %T A098207 1111110955555561,111111109555555561,11111111095555555561, %U A098207 1111111110955555555561,111111111109555555555561 %N A098207 a(n) is the square of near-repdigit number A033175(n). %C A098207 While repunit-squares are palindromic, squares of near repdigits provide other curious digit-patterns. %H A098207 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (111, -1110, 1000). %F A098207 a(n) = A033175(n)^2. %F A098207 From _Chai Wah Wu_, Nov 09 2018: (Start) %F A098207 a(n) = 111*a(n-1) - 1110*a(n-2) + 1000*a(n-3) for n > 2. %F A098207 G.f.: (-4000*x^2 - 850*x - 1)/((x - 1)*(10*x - 1)*(100*x - 1)). (End) %Y A098207 Cf. A033175, A055557. %K A098207 nonn,base,easy %O A098207 0,2 %A A098207 _Labos Elemer_, Oct 20 2004