A272719 Maximal number of steps in a nontouching path on an n X n grid such that each step has a different length.

2, 5, 8, 12, 17

Offset: 2

Author

Giovanni Resta, May 05 2016

Keywords

• nonn
• hard
• more

Comments

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

Examples

			An example for a(6)=17:
----------------
.  2  5  7  9 15
3  1  .  . 11 17
.  .  .  .  .  .
.  6  . 12  .  .
4 10  .  .  .  .
8 13  . 14 16 18
		

Links

• Giovanni Resta, Illustration of a(2)-a(6) and a(7) >= 22

Crossrefs

Cf. A226595.