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 A144596 #8 May 28 2025 15:39:22 %S A144596 0,0,0,0,1,0,0,0,1,0,0,0,0,1,0,0,0,1,0,0,0,0,1,0,0,0,1,0,0,0,0,1,0,0, %T A144596 0,1,0,0,0,0,1,0,0,0,1,0,0,0,0,1,0,0,0,1,0,0,0,0,1,0,0,0,1,0,0,0,0,1, %U A144596 0,0,0,1,0,0,0,0,1,0,0,0,1,0,0,0,0,1,0,0,0,1,0,0,0,0,1,0,0,0,1,0,0,0,0,1,0 %N A144596 Christoffel word of slope 2/7. %C A144596 The path is on the slope after 0, 9, 18, 27, 36 ,.... (A008591) steps, which gives the C-finite recurrence. %F A144596 a(n) = a(n-9). - _R. J. Mathar_, May 28 2025 %F A144596 G.f.: -x^4*(1+x^4) / ( (x-1)*(1+x+x^2)*(x^6+x^3+1) ). - _R. J. Mathar_, May 28 2025 %Y A144596 See A144595 for further details. %K A144596 nonn,easy %O A144596 0,1 %A A144596 _N. J. A. Sloane_, Jan 13 2009