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 A261102 #7 Aug 10 2015 07:34:11 %S A261102 0,1,2,3,5,4,7,6,10,9,8,15,14,13,12,11,23,22,21,20,19,18,17,16,34,33, %T A261102 32,31,30,29,28,27,26,25,24,51,50,49,48,47,46,45,44,43,42,41,40,39,38, %U A261102 37,36,35,76,75,74,73,72,71,70,69,68,67,66,65,64,63,62,61,60,59,58,57,56,55,54,53,52,113,112,111 %N A261102 Simple self-inverse permutation of natural numbers: after zero, list each block of A261091(n) numbers in reverse order, from A261082(n) to A261081(n+1). %C A261102 Maps between sequences A219648 and A261076. %H A261102 Antti Karttunen, <a href="/A261102/b261102.txt">Table of n, a(n) for n = 0..7624</a> %H A261102 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %Y A261102 Cf. A261081, A261082, A261091, A261101. %Y A261102 Cf. A219648, A261076. %Y A261102 Cf. also A218602 (analogous sequence for base-2). %K A261102 nonn %O A261102 0,3 %A A261102 _Antti Karttunen_, Aug 09 2015