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 A120233 #2 Mar 30 2012 18:57:06 %S A120233 1,2,4,3,6,8,5,10,12,7,14,9,17,18,11,21,22,13,25,15,28,16,30,32,33,19, %T A120233 20,37,38,40,23,24,44,45,26,27,49,50,29,53,54,31,57,58,60,34,35,36,65, %U A120233 66,68,39,70,72,41,42,76,43,78,80,81,46,47,48,86,88,89,51,92,52,94,96 %N A120233 Split-floor-multiplier sequence (SFMS) using multipliers 3/4 and 4/3. (SFMS is defined at A120229.). %C A120233 A permutation of the natural numbers. %F A120233 a(n)=[3n/4] if this is positive and new, else a(n)=[4n/3]. %Y A120233 Cf. A120229. %K A120233 nonn %O A120233 1,2 %A A120233 _Clark Kimberling_, Jun 11 2006