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Search: id:A087519
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| A087519 |
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Number of arrangements of 1..n^2 in n X n array with one local minimum and one local maximum. |
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+0
2
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OFFSET
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1,2
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COMMENT
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Neighbors of a cell are only considered in the X and Y directions.
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EXAMPLE
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For n=2, 12 has one local max. whereas 13 has two local maxima
........ 34 and one local min. ....... 42 and two local minima
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CROSSREFS
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Cf. A087518.
Sequence in context: A049030 A051551 A003773 this_sequence A060616 A016936 A013721
Adjacent sequences: A087516 A087517 A087518 this_sequence A087520 A087521 A087522
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KEYWORD
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nonn,nice
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AUTHOR
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Ron Hardin (rhhardin(AT)att.net), Oct 23 2003
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