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 A195121 #24 Jan 21 2023 04:56:38
%S A195121 0,2,3,5,6,7,9,10,12,13,14,16,17,18,20,21,23,24,25,27,28,30,31,32,34,
%T A195121 35,36,38,39,41,42,43,45,46,47,49,50,52,53,54,56,57,59,60,61,63,64,65,
%U A195121 67,68,70,71,72,74,75,77,78,79,81,82,83,85,86,88,89,90,92,93,94
%N A195121 a(n) = 2*n - floor(n/r), where r = (1 + sqrt(5))/2 (the golden ratio).
%C A195121 Apparently, the nonzero terms are the numbers whose maximal Lucas representation (A130311) ends with 1. - _Amiram Eldar_, Jan 21 2023
%H A195121 Vincenzo Librandi, <a href="/A195121/b195121.txt">Table of n, a(n) for n = 0..10000</a>
%F A195121 a(n) = 3*n - floor(n*r), where r = (1 + sqrt(5))/2.
%t A195121 Table[2n-Floor[n/GoldenRatio],{n,0,70}] (* _Harvey P. Dale_, Feb 11 2018 *)
%o A195121 (Magma) [3*n-Floor(n*(1+Sqrt(5))/2): n in [0..70]]; // _Vincenzo Librandi_, Sep 12 2011
%Y A195121 Cf. A001622, A130311.
%K A195121 nonn
%O A195121 0,2
%A A195121 _Clark Kimberling_, Sep 09 2011