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 A109250 #15 Feb 16 2025 08:32:58 %S A109250 2,1,4,3,7,9,5,12,6,14,16,8,19,10,21,11,24,26,13,28,15,31,33,17,36,18, %T A109250 38,20,41,43,22,45,23,48,50,25,53,27,55,57,29,60,30,62,32,65,67,34,70, %U A109250 35,72,74,37,77,39,79,40,82,84,42,86,44,89,91,46,94 %N A109250 Self-inverse integer permutation induced by Beatty sequences for 1+sqrt(2) and 1+1/sqrt(2). %H A109250 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/BeattySequence.html">Beatty Sequence</a> %H A109250 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %H A109250 <a href="/index/Be#Beatty">Index entries for sequences related to Beatty sequences</a> %F A109250 a(A003151(n))=A003152(n) and a(A003152(n))=A003151(n). %Y A109250 Cf. A003151, A003152. %Y A109250 Cf. A014176 (1+sqrt(2)). %K A109250 nonn %O A109250 1,1 %A A109250 _Reinhard Zumkeller_, Jun 23 2005