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 A120231 #2 Mar 30 2012 18:57:06 %S A120231 1,3,2,6,7,4,10,5,13,15,16,8,19,9,22,24,11,12,28,30,14,33,34,36,37,17, %T A120231 18,42,43,20,46,21,49,51,23,54,55,25,26,60,27,63,64,29,67,69,31,32,73, %U A120231 75,76,78,35,81,82,84,38,87,39,40,91,41,94,96,97,44,100,45,103,105,47 %N A120231 Split-floor-multiplier sequence (SFMS) using multipliers 2/3 and 3/2. (SFMS is defined at A120229.). %C A120231 A permutation of the natural numbers. %F A120231 a(n)=[2n/3] if this is positive and new, else a(n)=[3n/2]. %e A120231 a(1)=[3/2]=1 because [2/3] is not positive. %e A120231 a(2)=[2*3/2]=3. %e A120231 a(3)=[3*2/3]=2. %Y A120231 Cf. A073675, A120230. %K A120231 nonn %O A120231 1,2 %A A120231 _Clark Kimberling_, Jun 11 2006