A201617 Number of n X n 0..3 arrays with rows and columns lexicographically nondecreasing and every element equal to at least one horizontal or vertical neighbor

0, 16, 378, 91223, 136175057, 1492809994673

Offset

1,2

Comments

Diagonal of A201625

Links

Table of n, a(n) for n=1..6.

Example

Some solutions for n=4
..0..0..3..3....0..0..0..1....0..0..1..1....0..0..1..1....0..0..2..2
..2..2..1..3....0..2..3..1....1..2..2..2....0..3..0..1....3..3..1..1
..2..2..1..3....1..2..3..1....1..2..3..3....0..3..0..2....3..3..1..2
..3..3..1..1....1..2..3..3....3..3..1..1....1..1..0..2....3..3..2..2

Crossrefs

Sequence in context: A027403 A264073 A333581 * A235672 A235729 A189766

Adjacent sequences: A201614 A201615 A201616 * A201618 A201619 A201620

Keyword

nonn

Author

R. H. Hardin Dec 03 2011

Status

approved