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 A098208 #11 Nov 09 2018 22:04:55
%S A098208 1,923521,12003612721,123111473904721,1234222258516824721,
%T A098208 12345333336962946024721,123456444444807407238024721,
%U A098208 1234567555555591851850158024721,12345678666666670296296279358024721
%N A098208 4th powers of A033175(n) near repdigit numbers.
%C A098208 Display peculiar digit patterns.
%F A098208 From _Chai Wah Wu_, Nov 09 2018: (Start)
%F A098208 a(n) = 11111*a(n-1) - 11222110*a(n-2) + 1122211000*a(n-3) - 11111000000*a(n-4) + 10000000000*a(n-5) for n > 4.
%F A098208 G.f.: (-160000000000*x^4 - 102065000000*x^3 - 1753593000*x^2 - 912410*x - 1)/((x - 1)*(10*x - 1)*(100*x - 1)*(1000*x - 1)*(10000*x - 1)). (End)
%t A098208 (FromDigits/@Table[Join[PadLeft[{},n,3],{1}],{n,0,20}])^4 (* _Harvey P. Dale_, Oct 20 2011 *)
%Y A098208 Cf. A033175, A055557, A098207.
%K A098208 nonn,base
%O A098208 0,2
%A A098208 _Labos Elemer_, Oct 20 2004