A203845 Number of nX7 0..3 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors

1, 3502, 4683983, 2828543595, 1851737877261, 1343321735549790, 962798716189325069, 683655464831096685412, 487678114181526321589432, 348497070880545014679320935, 248863069745305150479109312811

Offset

1,2

Comments

Column 7 of A203846

Links

R. H. Hardin, Table of n, a(n) for n = 1..12

Example

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

Crossrefs

Sequence in context: A252049 A108117 A233992 * A257316 A224724 A338978

Adjacent sequences: A203842 A203843 A203844 * A203846 A203847 A203848

Keyword

nonn

Author

R. H. Hardin Jan 06 2012

Status

approved