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 A104159 #20 Jul 14 2025 09:59:27
%S A104159 4,20,1,16,6,17,8,12,9,14,5,19,2,15,3,18,7,11,10,13,4,20,1,16,6,17,8,
%T A104159 12,9,14,5,19,2,15,3,18,7,11,10,13,4,20,1,16,6,17,8,12,9,14,5,19,2,15,
%U A104159 3,18,7,11,10,13,4,20,1,16,6,17,8,12,9,14,5,19,2,15,3
%N A104159 Numbers on a Manchester or Log-End dartboard, as read in a standard, clockwise direction.
%C A104159 Sequence is periodic with period 20. - _Michel Marcus_, Jul 26 2013
%H A104159 Paolo Xausa, <a href="/A104159/b104159.txt">Table of n, a(n) for n = 1..10000</a>
%H A104159 K. S. Brown, <a href="http://www.mathpages.com/home/kmath025.htm">The Dartboard Sequence</a>
%H A104159 Sven Silow, <a href="http://www.thedartmart.com/dart_faq/Sect1/14.htm">Why this particular numbering scheme?</a>
%H A104159 <a href="/index/Rec#order_20">Index entries for linear recurrences with constant coefficients</a>, signature (0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1).
%t A104159 PadRight[{}, 100, {4, 20, 1, 16, 6, 17, 8, 12, 9, 14, 5, 19, 2, 15, 3, 18, 7, 11, 10, 13}] (* _Paolo Xausa_, Jul 14 2025 *)
%Y A104159 Cf. A003833, A104158.
%K A104159 nonn,easy
%O A104159 1,1
%A A104159 Andrew G. West (WestA(AT)wlu.edu), Mar 09 2005