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 A065650 #10 Aug 15 2015 10:29:02 %S A065650 0,1,2,3,4,5,6,7,8,9,11,10,15,17,19,21,23,25,27,29,31,12,30,37,39,41, %T A065650 43,45,47,49,51,13,32,50,59,61,63,65,67,69,71,14,34,52,70,81,83,85,87, %U A065650 89,91,16,35,54,72,90,103,105,107,109,111,18,36,56,74,92,110,125,127 %N A065650 Inverse permutation to A065649. %H A065650 Reinhard Zumkeller, <a href="/A065650/b065650.txt">Table of n, a(n) for n = 0..10000</a> %H A065650 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %o A065650 (Haskell) %o A065650 import Data.List (elemIndex); import Data.Maybe (fromJust) %o A065650 a065650 = fromJust . (`elemIndex` a065649_list) %o A065650 -- _Reinhard Zumkeller_, Aug 13 2015 %Y A065650 Cf. A033307, A065648, A065649, A261334. %Y A065650 Cf. A261279 (fixed points), A261294. %K A065650 base,nonn,look %O A065650 0,3 %A A065650 Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de), Nov 09 2001 %E A065650 Offset changed by _Reinhard Zumkeller_, Aug 13 2015