A198658 Number of nX4 0..7 arrays with values 0..7 introduced in row major order and each element equal to at least one horizontal or vertical neighbor

2, 76, 3904, 344044, 40065880, 6046334324, 1099981072751, 231069206905205, 53332894057280732, 13062771135606107106, 3312119561085281340968, 856694689962959996618514, 224079649012945587508397744

Offset

1,1

Comments

Column 4 of A198661

Links

R. H. Hardin, Table of n, a(n) for n = 1..17

Example

Some solutions with all values 0 to 7 for n=4
..0..0..1..1....0..0..1..1....0..1..2..2....0..1..2..3....0..1..1..2
..2..2..3..4....2..2..3..4....0..1..3..3....0..1..2..3....0..3..3..2
..5..6..3..4....5..5..3..4....4..5..5..6....4..5..6..6....4..5..5..6
..5..6..7..7....6..6..7..7....4..7..7..6....4..5..7..7....4..7..7..6

Crossrefs

Sequence in context: A198704 A198623 A198651 * A277298 A087287 A349066

Adjacent sequences: A198655 A198656 A198657 * A198659 A198660 A198661

Keyword

nonn

Author

R. H. Hardin Oct 28 2011

Status

approved