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 A120235 #2 Mar 30 2012 18:57:06 %S A120235 2,5,1,10,12,15,17,3,22,4,27,30,32,35,6,40,42,7,47,8,52,55,9,60,62,65, %T A120235 67,11,72,75,77,80,13,85,14,90,92,95,97,16,102,105,107,110,18,115,117, %U A120235 19,122,20,127,130,21,135,140,142,23,147,24,152,155,25,160,26,165,167 %N A120235 Split-floor-multiplier sequence (SFMS) using multipliers 2/5 and 5/2. (SFMS is defined at A120229.). %C A120235 A permutation of the natural numbers. %F A120235 a(n)=[2n/5] if this is positive and new, else a(n)=[5n/2]. %Y A120235 Cf. A120229, A120236. %K A120235 nonn %O A120235 1,1 %A A120235 _Clark Kimberling_, Jun 11 2006