

A272719


Maximal number of steps in a nontouching path on an n X n grid such that each step has a different length.


1




OFFSET

2,1


COMMENTS

a(7) >= 22, see illustration in Links.


LINKS



EXAMPLE

An example for a(6)=17:

. 2 5 7 9 15
3 1 . . 11 17
. . . . . .
. 6 . 12 . .
4 10 . . . .
8 13 . 14 16 18


CROSSREFS



KEYWORD

nonn,hard,more


AUTHOR



STATUS

approved



