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 A152764 #16 Apr 20 2024 10:48:46
%S A152764 1,111,11011,1100011,110000011,11000000011,1100000000011,
%T A152764 110000000000011,11000000000000011,1100000000000000011,
%U A152764 110000000000000000011,11000000000000000000011
%N A152764 Bisection of A138144.
%H A152764 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (101,-100).
%F A152764 From _Colin Barker_, Sep 16 2013: (Start)
%F A152764 a(n) = 11+11*10^(2*n-3) for n>2.
%F A152764 a(n) = 101*a(n-1)-100*a(n-2) for n>4.
%F A152764 G.f.: -x*(10*x-1)*(10*x+1)^2 / ((x-1)*(100*x-1)). (End)
%e A152764 n ...... a(n)
%e A152764 1 ....... 1
%e A152764 2 ...... 111
%e A152764 3 ..... 11011
%e A152764 4 .... 1100011
%e A152764 5 ... 110000011
%t A152764 LinearRecurrence[{101,-100},{1,111,11011,1100011},20] (* _Harvey P. Dale_, Nov 26 2019 *)
%o A152764 (PARI) Vec(-x*(10*x-1)*(10*x+1)^2/((x-1)*(100*x-1)) + O(x^100)) \\ _Colin Barker_, Sep 16 2013
%Y A152764 Cf. A135577, A138120, A138146, A152756, A152758, A058764.
%K A152764 easy,nonn,base
%O A152764 1,2
%A A152764 _Omar E. Pol_, Dec 14 2008