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 A120237 #2 Mar 30 2012 18:57:06 %S A120237 1,2,4,5,3,8,9,11,6,7,15,16,18,19,10,22,12,25,13,14,29,31,32,33,17,36, %T A120237 38,39,20,21,43,45,23,24,49,50,26,53,27,28,57,59,30,62,63,65,66,67,34, %U A120237 35,72,73,37,76,77,79,40,41,83,42,86,87,44,90,91,46,47,48,97,98,100,101 %N A120237 Split-floor-multiplier sequence (SFMS) using multipliers 2^(-1/2) and 2^(1/2). (SFMS is defined at A120229.). %C A120237 A permutation of the natural numbers. %F A120237 a(n)=[nr] if this is positive and new, else a(n)=[n/r], where r=2^(-1/2). %Y A120237 Cf. A120229, A120238. %K A120237 nonn %O A120237 1,2 %A A120237 _Clark Kimberling_, Jun 11 2006