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 A065307 #13 May 27 2021 09:15:15 %S A065307 1,2,3,4,5,6,7,9,8,10,11,12,13,15,14,16,17,18,19,24,20,21,25,22,26,29, %T A065307 23,27,28,33,30,31,34,35,32,41,36,38,37,39,40,42,43,51,44,45,52,46,48, %U A065307 53,47,54,58,49,55,67,50,56,57,62,59,60,63,64,61,74,65,68,66,69,70,79 %N A065307 "Inverse" to A065306. %H A065307 Reinhard Zumkeller, <a href="/A065307/b065307.txt">Table of n, a(n) for n = 1..10000</a> %H A065307 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %o A065307 (Haskell) %o A065307 import Data.List (elemIndex) %o A065307 import Data.Maybe (fromJust) %o A065307 a065307 n = (fromJust $ elemIndex n a065306_list) + 1 %o A065307 -- _Reinhard Zumkeller_, Jan 30 2012 %Y A065307 Cf. A065305, A065306. %Y A065307 Cf. A205666 (fixed points). %K A065307 nice,nonn %O A065307 1,2 %A A065307 Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de), Oct 29 2001