A198527 Number of nX7 0..4 arrays with values 0..4 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors

855, 47436498, 3201911378187, 217885196778717007, 14827770532074166305565, 1009078065869144136137180812

Offset

1,1

Comments

Column 7 of A198528

Links

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

Example

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

Crossrefs

Sequence in context: A100969 A183998 A209502 * A234885 A251453 A087002

Adjacent sequences: A198524 A198525 A198526 * A198528 A198529 A198530

Keyword

nonn

Author

R. H. Hardin Oct 26 2011

Status

approved