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 A065649 #11 Aug 15 2015 10:27:13 %S A065649 0,1,2,3,4,5,6,7,8,9,11,10,21,31,41,12,51,13,61,14,71,15,81,16,91,17, %T A065649 101,18,111,19,22,20,32,121,42,52,62,23,72,24,82,25,92,26,102,27,112, %U A065649 28,122,29,33,30,43,131,53,132,63,73,83,34,93,35,103,36,113,37,123,38 %N A065649 Permutation of nonnegative integers based on Champernowne's constant 0.123456789101112131415... %C A065649 A261293(n) = a(a(n)). - _Reinhard Zumkeller_, Aug 14 2015 %H A065649 Reinhard Zumkeller, <a href="/A065649/b065649.txt">Table of n, a(n) for n = 0..10000</a> %H A065649 Klaus Strassburger, <a href="/A065649/a065649.jpg">Illustration</a> %H A065649 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %F A065649 a(n) = if n = 0 then 0 else 10*(A065648(n)-1) + A033307(n-1). %o A065649 (Haskell) %o A065649 a065649 n = a065649_list !! n %o A065649 a065649_list = zipWith (+) %o A065649 (map ((* 10) . subtract 1) a065648_list) (0 : a033307_list) %o A065649 -- _Reinhard Zumkeller_, Aug 13 2015 %Y A065649 A033307, A065648, A065650. %Y A065649 Cf. A261279 (fixed points), A261293, A261333. %K A065649 base,nice,nonn,look %O A065649 0,3 %A A065649 Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de), Nov 09 2001 %E A065649 Offset and defining formula adjusted by _Reinhard Zumkeller_, Aug 13 2015