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 A276867 #9 Sep 26 2016 21:37:52
%S A276867 3,4,3,4,4,3,4,3,4,4,3,4,4,3,4,3,4,4,3,4,3,4,4,3,4,4,3,4,3,4,4,3,4,4,
%T A276867 3,4,3,4,4,3,4,3,4,4,3,4,4,3,4,3,4,4,3,4,3,4,4,3,4,4,3,4,3,4,4,3,4,4,
%U A276867 3,4,3,4,4,3,4,3,4,4,3,4,4,3,4,3,4,4
%N A276867 First differences of the Beatty sequence A003231 for 2 + tau, where tau = golden ratio = (1 + sqrt(5))/2.
%H A276867 Clark Kimberling, <a href="/A276867/b276867.txt">Table of n, a(n) for n = 1..10000</a>
%F A276867 a(n) = floor(n*r) - floor(n*r - r), where r = 2 + tau, n >= 1.
%t A276867 z = 500; r = 2+GoldenRatio; b = Table[Floor[k*r], {k, 0, z}]; (* A003231 *)
%t A276867 Differences[b] (* A276867 *)
%Y A276867 Cf. A003231, A276886.
%K A276867 nonn,easy
%O A276867 1,1
%A A276867 _Clark Kimberling_, Sep 24 2016