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A271449
Greatest number of edges in a simple polygon on an n X n grid with no two edges parallel or perpendicular.
2
0, 3, 6, 9, 12, 18
OFFSET
2,2
COMMENTS
a(8) >= 22, see picture in Links.
EXAMPLE
a(5)=9 because of this polygon on a 5 X 5 grid:
2 . . . .
. . 1 3 5
. . 4 . 7
. 6 . . 8
9 . . . .
See Links for other examples.
CROSSREFS
Cf. A255981.
Sequence in context: A127621 A049707 A213685 * A261956 A344683 A166633
KEYWORD
nonn,more
AUTHOR
Giovanni Resta, May 05 2016
STATUS
approved