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 A190135 #10 Jul 13 2013 12:04:08 %S A190135 1,4370,6452,6725,6998,7271,7544,7817,8090,8363,8636,8909,9182,9455, %T A190135 9728,2,275,548,821,1094,1367,1640,1913,2186,2459,2732,3005,3278,3551, %U A190135 3824,4097,4371,4644,4917,5190,5463,5736,6009,6282,6316,6333,6350,6367,6384 %N A190135 Inverse permutation to A190134. %C A190135 a(A190134(n)) = A190134(a(n)) = n. %H A190135 Reinhard Zumkeller, <a href="/A190135/b190135.txt">Table of n, a(n) for n = 1..10000</a> (full sequence) %o A190135 (Haskell) %o A190135 import Data.List (elemIndex) %o A190135 import Data.Maybe (fromJust) %o A190135 a190135 n = a190135_list !! (n-1) %o A190135 a190135_list = %o A190135 map (succ . fromJust . (`elemIndex` a190134_list)) [1..10000] %K A190135 nonn,base,fini,full %O A190135 1,2 %A A190135 _Reinhard Zumkeller_, May 06 2011