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 A118117 #6 Aug 09 2020 18:22:14
%S A118117 1,2,33,444,55555,66666666,7777777777777,888888888888888888888,
%T A118117 9999999999999999999999999999999999,
%U A118117 10101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010
%N A118117 Concatenate n F(n) times.
%C A118117 A000461 Concatenate n n times.
%D A118117 F. Smarandache, "Properties of the numbers", Univ. of Craiova Archives, 1975; Arizona State University Special Collections, Tempe, AZ.
%F A118117 a(n) = n concatenated A000045(n) times. a(n) = A000027(n) concatenated A000045(n) times.
%e A118117 a(6) = 6 concatenated F(6) times = 6 concatenated 8 times = 66666666, where F(n) = the n-th Fibonacci number.
%t A118117 Table[FromDigits[Flatten[IntegerDigits/@PadRight[{},Fibonacci[n],n]]],{n,10}] (* _Harvey P. Dale_, Aug 09 2020 *)
%Y A118117 Cf. A000045, A000461, A004216, A048376, A053422.
%K A118117 base,easy,nonn
%O A118117 1,2
%A A118117 _Jonathan Vos Post_, May 11 2006