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 A126565 #5 Jun 24 2019 22:13:35 %S A126565 0,1,0,0,1,0,0,1,0,0,1,0,0,1,1,0,1,1,0,1,1,0,1,1,0,0,1,0,0,1,0,0,1,0, %T A126565 0,1,1,0,1,1,0,1,1,0,1,1,0,0,1,0,0,1,0,0,1,0,0,1,1,0,1,1,0,1,1,0,1,1, %U A126565 0,0,1,0,0,1,0,0,1,0,0,1,1,0,1,1,0,1,1,0,1,1,0,0,1,0,0,1,0,0,1,0,0,1,1,0,1 %N A126565 a(n) = ceiling(sin(n)*cos(n)). %C A126565 For all nonzero integers n, ceiling(sin(n)*cos(n)) = 1 + floor(sin(n)*cos(n)), so a(n) = 1 + A126564(n) for n > 0 (a(0) = A126564(0) = 0). %F A126565 a(n) = ceiling(sin(n)*cos(n)). %o A126565 (PARI) a(n) = ceil(sin(n)*cos(n)) %Y A126565 Cf. A126564. %K A126565 nonn %O A126565 0,1 %A A126565 _Rick L. Shepherd_, Dec 27 2006