OFFSET
2,2
COMMENTS
a(8) >= 22, see picture in Links.
LINKS
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
KEYWORD
nonn,more
AUTHOR
Giovanni Resta, May 05 2016
STATUS
approved