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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

COMMENTS

a(8) >= 22, see picture in Links.

LINKS

Table of n, a(n) for n=2..7.

Giovanni Resta, Illustration of a(3)-a(7) and a(8) >= 22

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 A166633 A310154

Adjacent sequences:  A271446 A271447 A271448 * A271450 A271451 A271452

KEYWORD

nonn,more

AUTHOR

Giovanni Resta, May 05 2016

STATUS

approved

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Last modified October 21 17:10 EDT 2018. Contains 316427 sequences. (Running on oeis4.)