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 A130821 #6 Nov 29 2022 01:31:35 %S A130821 1,1,3,3,3,3,5,5,5,5,5,5,7,7,7,7,7,7,7,7,9,9,9,9,9,9,9,9,9,9,11,11,11, %T A130821 11,11,11,11,11,11,11,11,11,13,13,13,13,13,13,13,13,13,13,13,13,13,13, %U A130821 15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15 %N A130821 2n-1 appears 2n times. %F A130821 a(n) = A131507(ceiling(n/2)-1). - _Georg Fischer_, Nov 28 2022 %Y A130821 Cf. A131507. %K A130821 nonn %O A130821 1,3 %A A130821 _Paul Curtz_, Jul 17 2007