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 A058634 #6 Jun 11 2020 07:46:53 %S A058634 1,1,-4,-2,2,-2,9,-2,1,-4,-2,1,-4,-2,1,-4,-2,1,-3,-2,1,-3,-2,1,-4,-2, %T A058634 1,-4,-2,2,-2,12,1,1,-4,-2,1,-3,-2,2,-2,8,-3,-2,-6,1,16,-3,-2,7,-12,1, %U A058634 -4,-2,2,-3,-3,-3,-2,-6,1,2,-2,2,-3,-2,-6,1,4,-3,-2,9,-2,2,-3,-2,-4,-2,1,-3,-2,1,-3,-2,2,-3,-2,-7,1,4,-2,70,4,-2,27 %N A058634 a(n) = floor(b(n)), where b(n) = 1/cos(b(n-1)), b(0) = 1. %e A058634 a(3) = -2 because: b(0) = 1, b(1) = 1/cos(1) = 1.850815..., b(2) = 1/cos(1.850815) = -3.618291..., b(3) = 1/cos(-3.618291) = -1.125468... and a(3) = floor(b(3)) = -2 %o A058634 (PARI) default(realprecision,1000); b=1; for(n=0, 94, print1(floor(b)", "); b=1/cos(b)) %Y A058634 Cf. A000319. %K A058634 sign %O A058634 0,3 %A A058634 Avi Peretz (njk(AT)netvision.net.il), Dec 26 2000 %E A058634 More terms from _Ralf Stephan_, Mar 23 2003