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 A265335 #7 Dec 13 2015 07:50:18 %S A265335 0,1,2,3,4,5,9,10,8,6,7,11,12,13,29,45,16,17,33,49,20,21,37,41,36,25, %T A265335 26,42,40,14,30,46,32,18,34,50,24,22,38,39,28,23,27,43,44,15,31,47,48, %U A265335 19,35,51,52,77,141,157,116,93,109,173,180,61,125,189,64,65,129,193,68,81,145,161,132,97,113,177,196,53,117,181,80,69 %N A265335 Self-inverse permutation of nonnegative integers: a(n) = A264994(5*n)/5. %H A265335 Antti Karttunen, <a href="/A265335/b265335.txt">Table of n, a(n) for n = 0..13107</a> %H A265335 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %F A265335 a(n) = A264994(5*n)/5. %o A265335 (define (A265335 n) (/ (A264994 (* 5 n)) 5)) %Y A265335 Cf. A264994, A264993. %K A265335 nonn,base %O A265335 0,3 %A A265335 _Antti Karttunen_, Dec 07 2015