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 A260029 #12 Jan 19 2025 03:29:26 %S A260029 9,1001,1111101001,1000010001110100000111001001001 %N A260029 Convert the last term from decimal to binary! a(1)=9. %Y A260029 For initial terms 2 through 12 see A008559, A006938, A260025, A260024, A260026, A260027, A260028, A260029, A008559 (again), A006938 (again), A260030 respectively. %K A260029 nonn,base %O A260029 1,1 %A A260029 _N. J. A. Sloane_, Jul 14 2015