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 A054069 #10 Mar 30 2012 18:57:01 %S A054069 1,3,2,5,4,6,9,7,10,8,14,12,15,13,11,19,17,21,18,16,20,26,23,28,25,22, %T A054069 27,24,33,30,35,32,29,34,31,36,42,38,44,40,37,43,39,45,41,52,48,54,50, %U A054069 46,53,49,55,51,47,62,58,65,60,56,63,59,66 %N A054069 Inverse of the permutation A054068 of natural numbers. %C A054069 As an interspersion, row n gives the positions of n in the fractal sequence A054065. %H A054069 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %e A054069 Northwest corner, as an interspersion: %e A054069 1...2...5...8...12..18..24 %e A054069 3...6...10..14..20..27..35 %e A054069 4...7...11..16..22..30..38 %e A054069 9...13..19..25..33..42..51 %e A054069 15..21..28..36..45..55..66 %t A054069 (See A054065.) %Y A054069 A054065, A054068, A194832. %K A054069 nonn %O A054069 1,2 %A A054069 _Clark Kimberling_