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 A276799 #26 Feb 15 2019 14:56:10
%S A276799 1,0,1,0,1,1,1,1,0,0,0,1,0,1,0,1,0,1,1,1,1,0,0,0,1,0,1,0,2,1,1,1,0,1,
%T A276799 0,1,1,1,0,1,0,2,1,1,1,0,0,0,1,1,1,0,0,0,0,1,0,1,0,0,0,1,1,1,0,0,0,0,
%U A276799 1,0,1,0,1,1,1,1,0,0,0,1,1,1,0,1,0,1,1,1,1,0,0,0,1,0,1,0,1,0,1,1
%N A276799 a(n) = floor(n*t^2) - A003145(n), where t = 1.8392867... is the tribonacci constant A058265.
%C A276799 a(n) is in {-1, 0, 1, 2}, but the first n for which -1 appears is n = 329. - _Jeffrey Shallit_, Nov 19 2016
%H A276799 N. J. A. Sloane, <a href="/A276799/b276799.txt">Table of n, a(n) for n = 1..10000</a>
%F A276799 a(n) = A277722(n) - A003145(n). - _R. J. Mathar_, Nov 02 2016
%Y A276799 Cf. A003144, A003145, A003146, A275926, A058265, A276800, A277721, A278352 (positions of -1's).
%K A276799 sign
%O A276799 1,29
%A A276799 _N. J. A. Sloane_, Oct 28 2016