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 A118911 #12 Jul 04 2023 21:22:57
%S A118911 1,1,3,3,3,3,5,5,3,3,9,9,5,5,11,11,3,3,9,9,9,9,15,15,5,5,15,15,11,11,
%T A118911 21,21,3,3,9,9,9,9,15,15,9,9,27,27,15,15,33,33,5,5,15,15,15,15,25,25,
%U A118911 11,11,33,33,21,21,43,43,3,3,9,9,9,9,15,15,9,9,27,27,15,15,33,33,9,9
%N A118911 Row sums of triangle in A128973.
%C A118911 Integers in A071053 repeated.
%F A118911 a(2*n) = a(2*n+1).
%F A118911 a(n) = Sum_{k=0..n} A128973(n,k).
%F A118911 a(2^k+m) = 3*a(m) for 0 <= m <= 2^(k-1) - 1, k >= 1.
%F A118911 a(4*n) = a(2*n) = A071053(n).
%Y A118911 Cf. A071053, A128973.
%K A118911 nonn
%O A118911 0,3
%A A118911 _Philippe Deléham_, May 02 2007, Jan 06 2008
%E A118911 a(48) and following terms corrected by _Georg Fischer_, Jul 04 2023