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 A152976 #2 Mar 30 2012 18:51:00 %S A152976 1,2,3,1,3,6,3,5,2,3,1,4,9,5,10,5,9,4,7,3,6,3,5,2,3,1,5,12,7,15,8,15, %T A152976 7,14,7,15,8,15,7,12,5,9,4,9,5,10,5,9,4,7,3,6,3,5,2,3,1,6,15,9,20,11, %U A152976 21,10,21,11,24,13,25,12,21,9,18,9,21,12,25,13,24,11,21,10,21,11,20,9,15,6 %N A152976 Denominators of the redundant Stern-Brocot structure; numerators=A152975. %C A152976 a(2^n-n+2*k) = A047679(2^(n-1)+k) for 0<=k<2^(n-1); %C A152976 a(2^n-n+2*k-1) = A047679(2^(n-1)+k-1) + A047679(2^(n-1)+k) for 0<k<2^(n-1); %C A152976 A060188(k+2) = Sum(a(i): 2^k <= i < 2^(k+1)). %D A152976 Milad Niqui, Formalising Exact Arithmetic, Ph.D. thesis, Radboud Universiteit Nijmegen, IPA Dissertation Series 2004-10, 2.6, p.65f . %H A152976 Milad Niqui, <a href="http://www.cs.ru.nl/~milad/proefschrift/thesis.pdf">Formalising Exact Arithmetic</a> %K A152976 frac,nonn,tabf %O A152976 1,2 %A A152976 _Reinhard Zumkeller_, Dec 22 2008