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 A266404 #7 Jan 09 2016 16:08:47 %S A266404 1,2,3,4,5,6,11,8,17,10,7,12,13,20,25,16,9,18,23,14,53,22,19,28,15,36, %T A266404 27,24,29,40,37,32,33,34,83,26,31,42,51,30,47,38,59,44,101,76,41,60, %U A266404 73,68,39,52,21,84,107,56,131,72,43,48,89,80,125,64,65,66,109,50,99,82,71,58,49,74,151,46,239,78,97,62,173,70,35,54 %N A266404 Self-inverse permutation of natural numbers: a(n) = A250470(A030101(A250469(n))). %H A266404 Antti Karttunen, <a href="/A266404/b266404.txt">Table of n, a(n) for n = 1..4096</a> %H A266404 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %F A266404 a(n) = A250470(A030101(A250469(n))) = A250470(A057889(A250469(n))). %F A266404 Other identities. For all n >= 0: %F A266404 A000035(a(n)) = A000035(n). [This permutation preserves the parity of n.] %o A266404 (Scheme) (define (A266404 n) (A250470 (A030101 (A250469 n)))) %Y A266404 Cf. A000035, A030101, A057889, A250469, A250470. %Y A266404 Cf. A265329, A266402 (other conjugates or similar derivations of A057889). %Y A266404 Cf. also A266403. %K A266404 nonn,base %O A266404 1,2 %A A266404 _Antti Karttunen_, Jan 02 2016