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 A244981 #14 Jul 22 2014 10:23:47 %S A244981 1,2,4,3,8,6,16,5,32,12,9,64,128,10,18,24,256,7,48,20,512,15,1024,36, %T A244981 96,27,2048,192,72,14,4096,30,8192,40,25,384,16384,11,144,80,32768,54, %U A244981 28,288,768,65536,21,131072,1536,50,108,60,262144,160,576,45,524288,1048576,3072,320,81,120,2097152,22,6144,4194304,42 %N A244981 Permutation of natural numbers: a(n) = A122111(A102750(n)) / 2. %H A244981 Antti Karttunen, <a href="/A244981/b244981.txt">Table of n, a(n) for n = 1..1024</a> %H A244981 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %F A244981 a(n) = A122111(A102750(n)) / 2. %o A244981 (Scheme) (define (A244981 n) (/ (A122111 (A102750 n)) 2)) %Y A244981 Inverse: A244982. %Y A244981 Cf. A122111, A102750, A244983-A244984, A243505-A243506, A243065-A243066. %K A244981 nonn %O A244981 1,2 %A A244981 _Antti Karttunen_, Jul 20 2014