A198905 Number of nX7 0..4 arrays with values 0..4 introduced in row major order and no element equal to any horizontal or vertical neighbor

187, 804833, 3794115705, 17895005957823, 84402688527136201, 398089706066811447174, 1877611081501313948217870, 8855851690895754550489882369, 41769091588504560613470987916898

Offset

1,1

Comments

Column 7 of A198906

Links

R. H. Hardin, Table of n, a(n) for n = 1..27

Example

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

Crossrefs

Sequence in context: A208199 A208406 A208413 * A198252 A070257 A204750

Adjacent sequences: A198902 A198903 A198904 * A198906 A198907 A198908

Keyword

nonn

Author

R. H. Hardin Oct 31 2011

Status

approved