1,2

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

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

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

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

Cf. A087518.

Sequence in context: A281821 A003773 A217021 * A222917 A060616 A297387

Adjacent sequences: A087516 A087517 A087518 * A087520 A087521 A087522

nonn,nice

R. H. Hardin, Oct 23 2003

approved