A250668 - OEIS

A250668

Number of (n+1) X (n+1) 0..3 arrays with nondecreasing x(i,j)+x(i,j-1) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction.

104, 5154, 388916, 41503790, 5803025694, 1009432228498, 210335029800118

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OFFSET

1,1

COMMENTS

Diagonal of A250676.

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

Some solutions for n=2

..1..1..1....1..2..0....2..2..1....0..2..0....3..0..3....1..0..0....1..0..2

..2..2..2....1..2..3....2..3..3....0..2..1....1..3..0....2..2..2....0..1..3

..2..2..2....1..2..3....2..3..3....1..1..3....3..1..3....2..2..2....2..3..1

CROSSREFS

Cf. A250676.

Sequence in context: A299333 A007267 A300174 * A035811 A004393 A286329

Adjacent sequences: A250665 A250666 A250667 * A250669 A250670 A250671

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 26 2014

STATUS

approved