A201624 Number of nX7 0..3 arrays with rows and columns lexicographically nondecreasing and every element equal to at least one horizontal or vertical neighbor

40, 6654, 1877283, 891142897, 464328365996, 242036871702096

Offset

1,1

Comments

Column 7 of A201625

Links

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

Example

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

Crossrefs

Sequence in context: A196706 A196855 A196949 * A295587 A183766 A364517

Adjacent sequences: A201621 A201622 A201623 * A201625 A201626 A201627

Keyword

nonn

Author

R. H. Hardin Dec 03 2011

Status

approved