A198668 Number of nX7 0..4 arrays with values 0..4 introduced in row major order and each element equal to one or two horizontal and vertical neighbors

11, 21243, 40546053, 119026441960, 319298496941179

Offset

1,1

Comments

Column 7 of A198669

Links

Table of n, a(n) for n=1..5.

Example

Some solutions with all values 0 to 4 for n=3
..0..0..1..1..0..0..2....0..0..1..1..2..3..0....0..0..1..2..2..3..3
..0..1..3..3..4..4..2....0..1..1..0..2..3..0....0..1..1..4..4..4..1
..0..1..1..0..0..0..2....0..1..0..0..4..4..0....0..0..0..0..1..1..1

Crossrefs

Sequence in context: A232066 A330301 A264917 * A346206 A198707 A198626

Adjacent sequences: A198665 A198666 A198667 * A198669 A198670 A198671

Keyword

nonn

Author

R. H. Hardin Oct 28 2011

Status

approved