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 A084493 #9 Jul 29 2017 13:30:47 %S A084493 1,3,2,5,6,4,9,7,8,12,11,10,14,15,16,13,18,20,17,19,22,24,23,21,27,25, %T A084493 28,26,31,30,32,29,35,36,33,34,39,40,38,37,44,41,42,43,48,45,47,46,52, %U A084493 50,49,51,56,54,55,53,60,59,57,58,64,63,62,61,66,67,69,65,68,71,73,70 %N A084493 a(n) = n + A084511(n) - 3. %H A084493 A. Karttunen, <a href="/A084507/a084507.scm.txt">Scheme-program for computing this sequence</a> %H A084493 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %Y A084493 Inverse: A084494. %Y A084493 Cf. A084495, A084453, A084459, A084489, A084497. %K A084493 nonn %O A084493 1,2 %A A084493 _Antti Karttunen_, Jun 02 2003