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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
1
2, 76, 3904, 344044, 40065880, 6046334324, 1099981072751, 231069206905205, 53332894057280732, 13062771135606107106, 3312119561085281340968, 856694689962959996618514, 224079649012945587508397744
OFFSET
1,1
COMMENTS
Column 4 of A198661
LINKS
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 28 2011
STATUS
approved