

A160392


Length of the longest directed, closed, nonintersecting 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
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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


LINKS

Table of n, a(n) for n=1..16.
Alex Chernov, Length of the longest rook path


CROSSREFS

Sequence in context: A081925 A049199 A192544 * A242272 A078609 A084809
Adjacent sequences: A160389 A160390 A160391 * A160393 A160394 A160395


KEYWORD

hard,nonn


AUTHOR

David Scambler, May 12 2009


EXTENSIONS

a(10)a(16) from Alex Chernov, Jan 15 2012


STATUS

approved



