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 A276612 #5 Sep 08 2016 17:53:33 %S A276612 0,1,4,3,2,10,9,8,7,6,5,19,18,17,16,15,14,13,12,11,33,32,31,30,29,28, %T A276612 27,26,25,24,23,22,21,20,52,51,50,49,48,47,46,45,44,43,42,41,40,39,38, %U A276612 37,36,35,34,77,76,75,74,73,72,71,70,69,68,67,66,65,64,63,62,61,60,59,58,57,56,55,54,53,108 %N A276612 Simple self-inverse permutation of natural numbers: after a(0)=0, list each block of A261229(n) numbers in reverse order, from A261227(n) to A261228(1+n). %C A276612 Maps between A276613 and A276614. %H A276612 Antti Karttunen, <a href="/A276612/b276612.txt">Table of n, a(n) for n = 0..10236</a> %H A276612 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %o A276612 (Scheme) %o A276612 (define (A276612 n) (if (zero? n) n (+ (- (A261228 (+ 1 (A276611 n))) n) (A261227 (A276611 n))))) %Y A276612 Cf. A261227, A261228, A261229, A276611, A276613, A276614. %K A276612 nonn %O A276612 0,3 %A A276612 _Antti Karttunen_, Sep 07 2016