login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A272719 Maximal number of steps in a nontouching path on an n X n grid such that each step has a different length. 1
2, 5, 8, 12, 17 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

COMMENTS

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

LINKS

Table of n, a(n) for n=2..6.

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

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

Cf. A226595.

Sequence in context: A229154 A174605 A108577 * A297834 A036789 A330188

Adjacent sequences:  A272716 A272717 A272718 * A272720 A272721 A272722

KEYWORD

nonn,hard,more

AUTHOR

Giovanni Resta, May 05 2016

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 19 02:36 EDT 2021. Contains 345125 sequences. (Running on oeis4.)