A203459 Number of nX7 0..2 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors.

1, 686, 237999, 44974778, 9441977403, 2078403848722, 449985495293440, 97229907706009899, 21076066091178687992, 4568715563183005120358, 989906518295763028607606, 214487030281717487899262669

Offset

1,2

Comments

Column 7 of A203460

Links

R. H. Hardin, Table of n, a(n) for n = 1..95

Example

Some solutions for n=5
..2..2..2..0..2..2..2....1..1..0..1..1..0..0....0..2..2..1..2..2..1
..2..0..2..1..2..0..2....1..1..1..2..2..2..2....2..2..2..2..2..2..2
..2..1..2..2..2..2..2....1..1..1..2..2..1..2....2..0..1..2..0..2..2
..2..2..2..1..2..1..2....0..1..1..0..2..0..2....2..1..0..2..0..2..2
..2..2..1..0..2..2..2....0..1..1..0..2..2..2....2..2..2..2..1..1..0

Crossrefs

Sequence in context: A232199 A222751 A234817 * A101944 A045150 A296811

Adjacent sequences: A203456 A203457 A203458 * A203460 A203461 A203462

Keyword

nonn

Author

R. H. Hardin, Jan 02 2012

Status

approved