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 A065250 #6 May 01 2014 02:49:07 %S A065250 3,1,15,5,12,7,63,2,23,48,6,29,60,31,255,9,20,11,95,192,24,51,26,14, %T A065250 119,240,30,125,252,127,1023,4,39,80,10,45,92,47,383,768,96,195,98,25, %U A065250 207,104,13,57,116,59,479,960,120,243,122,62,503,1008,126,509,1020,511 %N A065250 Permutation of N induced by the order-preserving permutation of the positive rational numbers (x -> 2x), positions in Stern-Brocot tree. %H A065250 <a href="/index/St#Stern">Index entries for sequences related to Stern's sequences</a> %H A065250 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %p A065250 [seq(A065250(j),j=1..120)]; A065250 := n -> frac2position_in_whole_SB_tree((SternBrocotTreeNum(n)/SternBrocotTreeDen(n))*2); %Y A065250 Cf. A057114, A065251. Inverse permutation A065249. %K A065250 nonn %O A065250 1,1 %A A065250 _Antti Karttunen_, Oct 25 2001