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 A052000 #10 Oct 17 2019 22:37:05 %S A052000 0,1,5,433494437,4807526976,53316291173 %N A052000 Fibonacci(k) starting with digits of its index number k. %C A052000 Next term '3301...7801' has 690 digits. %F A052000 a(n) = A000045(A038546(n)) %Y A052000 Cf. A000045, A038546, A000350, A050816. %K A052000 nonn,base %O A052000 1,3 %A A052000 _Patrick De Geest_, Oct 15 1999 %E A052000 Offset changed to 1 by _Jon E. Schoenfield_, Oct 17 2019