A198651 Number of nX4 0..6 arrays with values 0..6 introduced in row major order and each element equal to at least one horizontal or vertical neighbor

2, 76, 3904, 344008, 39898934, 5870175231, 996290832880, 184906809944845, 35956430134255744, 7167834458473450500, 1446698354699811336454, 293844456856748839234741, 59872951529043615795454004

Offset

1,1

Comments

Column 4 of A198654

Links

R. H. Hardin, Table of n, a(n) for n = 1..28

Example

Some solutions with all values 0 to 6 for n=4
..0..1..1..2....0..0..1..2....0..0..1..1....0..0..1..2....0..1..1..0
..0..3..4..2....3..3..1..2....2..2..1..3....0..3..1..2....0..2..2..0
..5..3..4..4....3..4..4..5....4..5..5..3....3..3..4..4....3..4..5..6
..5..6..6..6....6..6..6..5....4..6..6..3....5..5..6..6....3..4..5..6

Crossrefs

Sequence in context: A324216 A198704 A198623 * A198658 A277298 A087287

Adjacent sequences: A198648 A198649 A198650 * A198652 A198653 A198654

Keyword

nonn

Author

R. H. Hardin Oct 28 2011

Status

approved