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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
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: A362601 A174605 A108577 * A297834 A036789 A330188
KEYWORD
nonn,hard,more
AUTHOR
Giovanni Resta, May 05 2016
STATUS
approved

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Last modified June 20 11:12 EDT 2024. Contains 373527 sequences. (Running on oeis4.)