%I #10 Jul 19 2021 01:55:27
%S 20,1,18,4,13,6,10,15,2,17,3,19,7,16,8,11,14,9,12,5,20,1,18,4,13,6,10,
%T 15,2,17,3,19,7,16,8,11,14,9,12,5,20,1,18,4,13,6,10,15,2,17,3,19,7,16,
%U 8,11,14,9,12,5,20,1,18,4,13,6,10,15,2,17,3,19,7,16,8,11,14,9
%N Sectors around outside of dartboard.
%C Known as the standard, London or clock dartboard.
%D Marilyn vos Savant, "Ask Marilyn," in 'Parade, The Sunday Newspaper Magazine,' page 12, Sunday, Jan 12, 2003.
%H K. S. Brown, <a href="http://www.mathpages.com/home/kmath025.htm">The Dartboard Sequence</a>
%H American Darts Organization, <a href="http://www.adodarts.com/">Home page</a>
%H World Darts Federation, <a href="http://www.dartswdf.com/Rules/PlayRls/Playrule.html">WDF Playing and Tournament Rules</a>
%Y Cf. A008575.
%K nonn
%O 1,1
%A _N. J. A. Sloane_