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A200919
Number of crossings on periodic braids with n strands such that all strands meet.
1
0, 0, 0, 1, 3, 5, 9, 13, 19, 25, 34
(list; graph; refs; listen; history; text; internal format)
OFFSET
1,5
LINKS
Table of n, a(n) for n=1..11.
Duraid Madina, Illustration of initial terms a(1) .. a(7)
N. J. A. Sloane, Illustration for a(6) = 5
CROSSREFS
Sequence in context: A209974 A099392 A080827 * A213207 A102378 A118026
Adjacent sequences: A200916 A200917 A200918 * A200920 A200921 A200922
KEYWORD
nonn,hard,nice,more
AUTHOR
Duraid Madina, Nov 24 2011
EXTENSIONS
a(11) added by Duraid Madina, Oct 03 2012
a(7) corrected by Duraid Madina, Dec 11 2012
STATUS
approved

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Last modified October 3 23:34 EDT 2024. Contains 376494 sequences.
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