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 A076022 #4 Mar 30 2012 17:26:04 %S A076022 1,4,2,9,3,8,10,7,5,11,6,15,12,14,20,16,19,13,17,21,18,26,23,25,31,22, %T A076022 27,32,40,30,35,28,24,34,29,39,37,41,44,33,45,36,50,42,38,65,43,46,51, %U A076022 47,57,52,48,54,63,55,62,58,56,49,53,60,66,64,67,59,74,68,73,71,61,70 %N A076022 Position of 2n in A073662. %C A076022 It is not clear that each even number will appear in A073662, though I've checked it up to 20000. %F A076022 a(n) = position of (2n) in A073662: A073662(a(n)) = 2n. %e A076022 a(1)=4 because 2*1=2 appears at 4th position in A073662, a(14)=14 because 2*14=28 appears at 14th position in A073662, %Y A076022 Cf. A073662, A073664, A076023. %K A076022 easy,nonn %O A076022 1,2 %A A076022 _Zak Seidov_, Sep 30 2002