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A160392
Length of the longest directed, closed, non-intersecting rook path on an n X n chessboard avoiding right turns on squares of one color and avoiding left turns on the other color.
0
0, 0, 8, 12, 16, 20, 40, 48, 62, 76, 98, 116, 136, 156, 188, 208
OFFSET
1,3
COMMENTS
Turns must be chromatically correct. E.g., n=3, R=Right Turn, A=Ahead, longest path is 8:
RAR
A A
RAR
CROSSREFS
Sequence in context: A337806 A192544 A302139 * A242272 A078609 A084809
KEYWORD
hard,nonn
AUTHOR
David Scambler, May 12 2009
EXTENSIONS
a(10)-a(16) from Alex Chernov, Jan 15 2012
STATUS
approved