OFFSET
1,5
COMMENTS
a(n) >= ceiling(n(n-3)/8).
LINKS
Mathematics Stack Exchange, Making Friends around a Circular Table
EXAMPLE
For n = 7 the a(7) = 4 swaps are:
(1) 1 swaps with 4,
(2) 1 swaps with 5,
(3) 3 swaps with 6, and then
(4) 2 swaps with 6.
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Peter Kagey, Feb 24 2017
EXTENSIONS
a(13) and a(14) added by Dmitry Kamenetsky, Feb 26 2017
STATUS
approved