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 A109239 #13 Feb 16 2025 08:32:58 %S A109239 4,8,12,1,16,20,25,2,29,33,37,3,41,46,50,5,54,58,62,6,67,71,75,79,7, %T A109239 83,88,92,9,96,100,104,10,109,113,117,11,121,125,130,13,134,138,142, %U A109239 146,14,151,155,159,15,163,167,171,17,176,180,184,18,188,192 %N A109239 Self-inverse integer permutation induced by Beatty sequences for (e^2+1)/(e^2-1) and (e^2+1)/2. %C A109239 a(n) = A164088(n) for n <= 26. [_Reinhard Zumkeller_, Aug 11 2009] %H A109239 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/BeattySequence.html">Beatty Sequence</a> %H A109239 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %H A109239 <a href="/index/Be#Beatty">Index entries for sequences related to Beatty sequences</a> %F A109239 a(A109237(n))=A109238(n) and a(A109238(n))=A109237(n). %Y A109239 Cf. A109233, A109236, A109237, A109238. %K A109239 nonn %O A109239 1,1 %A A109239 _Reinhard Zumkeller_, Jun 23 2005