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 A137805 #7 Feb 16 2025 08:33:07 %S A137805 2,1,4,3,6,5,8,7,10,9,12,11,14,13,16,15,18,17,20,19,23,25,21,27,22,29, %T A137805 24,31,26,33,28,35,30,37,32,39,34,41,36,43,38,46,40,48,50,42,52,44,54, %U A137805 45,56,47,58,49,60,51,62,53,64,55,67,57,69,59,71,73,61,75,63,77,65,79 %N A137805 Self-inverse integer permutation induced by Beatty sequences for Sqrt(2)+1/2 and (4*Sqrt(2)+9)/7. %H A137805 R. Zumkeller, <a href="/A137805/b137805.txt">Table of n, a(n) for n = 1..1000</a> %H A137805 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/BeattySequence.html">Beatty Sequence</a> %H A137805 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %H A137805 <a href="/index/Be#Beatty">Index entries for sequences related to Beatty sequences</a> %F A137805 a(A137803(n)) = A137804(n) and a(A137804(n)) = A137803(n). %K A137805 nonn %O A137805 1,1 %A A137805 _Reinhard Zumkeller_, Feb 11 2008