A183582 Half the number of n X 7 0..3 arrays with each element equal to either the maximum or the minimum of its horizontal and vertical neighbors.

80, 65277, 14823037, 3724940988, 922710498351, 229716738097391, 57140106100076100, 14217486118795912134

Offset

1,1

Links

Table of n, a(n) for n=1..8.

Example

Some solutions with a(1,1)<=1 for 3 X 7:
..0..0..0..2..2..0..0....0..0..0..1..1..0..0....0..0..0..2..2..0..0
..0..0..0..0..2..0..0....0..0..1..1..1..1..1....0..0..0..0..0..0..3
..0..1..1..1..1..3..3....0..0..0..2..2..1..1....0..1..1..0..3..3..3

Crossrefs

Column 7 of A183584.

Sequence in context: A269145 A187052 A159377 * A068273 A068285 A159408

Adjacent sequences: A183579 A183580 A183581 * A183583 A183584 A183585

Keyword

nonn,more

Author

R. H. Hardin, Jan 05 2011

Status

approved