login
Number of crossings on periodic braids with n strands such that all strands meet.
1

%I #35 Aug 28 2013 06:46:13

%S 0,0,0,1,3,5,9,13,19,25,34

%N Number of crossings on periodic braids with n strands such that all strands meet.

%H Duraid Madina, <a href="/A200919/a200919_1.txt">Illustration of initial terms a(1) .. a(7)</a>

%H N. J. A. Sloane, <a href="/A200919/a200919.pdf">Illustration for a(6) = 5</a>

%K nonn,hard,nice,more

%O 1,5

%A _Duraid Madina_, Nov 24 2011

%E a(11) added by _Duraid Madina_, Oct 03 2012

%E a(7) corrected by _Duraid Madina_, Dec 11 2012