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A087519 Number of arrangements of 1..n^2 in n X n array with one local minimum and one local maximum. 1
1, 16, 3584, 58566144 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Neighbors of a cell are only considered in the X and Y directions.

LINKS

Table of n, a(n) for n=1..4.

EXAMPLE

For n=2, 12 has one local max. whereas 13 has two local maxima

........ 34 and one local min. ....... 42 and two local minima

CROSSREFS

Cf. A087518.

Sequence in context: A281821 A003773 A217021 * A222917 A060616 A297387

Adjacent sequences:  A087516 A087517 A087518 * A087520 A087521 A087522

KEYWORD

nonn,nice

AUTHOR

R. H. Hardin, Oct 23 2003

STATUS

approved

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Last modified March 23 16:52 EDT 2019. Contains 321432 sequences. (Running on oeis4.)