A104159 Numbers on a Manchester or Log-End dartboard, as read in a standard, clockwise direction.

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, 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, 3, 18, 7, 11, 10, 13, 4, 20, 1, 16, 6, 17, 8, 12, 9, 14, 5, 19, 2, 15, 3

Offset: 1

Author

Andrew G. West (WestA(AT)wlu.edu), Mar 09 2005

Keywords

• nonn
• easy

Comments

Sequence is periodic with period 20. - Michel Marcus, Jul 26 2013

Links

• Paolo Xausa, Table of n, a(n) for n = 1..10000
• K. S. Brown, The Dartboard Sequence
• Sven Silow, Why this particular numbering scheme?
• Index entries for linear recurrences with constant coefficients, signature (0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1).

Crossrefs

Cf. A003833, A104158.

Programs

Mathematica

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 *)