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 A244512 #27 Jul 19 2021 01:21:00 %S A244512 288,54,90,324,252,0,126,162,216,18,180,234,342,198,36,144,72,306,108, %T A244512 270 %N A244512 The angle of the center of each numbered sector of a standard competition dartboard. %C A244512 A standard dartboard is divided into 20 sectors each subtending an angle of 18 degrees. %C A244512 The sequence is generated by considering the positive x-axis to be running through the center of the sector numbered "6" and defining this to be 0 degrees. The angular position of each sector is then defined relative to this position through a clockwise rotation of a line collinear with x until the line divides the sector of interest. The numbers are then sectors are ordered from 1 to 20 generating the full sequence. %C A244512 It is a mere formality to fully define the bounds of each sector by adding and subtracting 9 degrees from each of the numbers in the sequence. %H A244512 Wikipedia, <a href="http://en.wikipedia.org/wiki/Darts">Darts</a> %F A244512 n = A003833(a(n)/18+6). - _Jens Kruse Andersen_, Jul 19 2014 %Y A244512 Cf. A003833, A008575. %K A244512 nonn,fini,full %O A244512 1,1 %A A244512 _Philip Mizzi_, Jun 29 2014 %E A244512 Incorrect term removed by _Jens Kruse Andersen_, Jul 19 2014