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A268144
Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to at least one diagonal or antidiagonal neighbor and the top left element equal to 0.
0
0, 6, 6, 672, 4734, 177048, 4131792, 132137160, 4330697670, 144754955796
OFFSET
1,2
COMMENTS
Row 4 of A268142.
EXAMPLE
Some solutions for n=4
..0..0..2..1....0..3..2..3....0..1..1..2....0..3..0..3....0..1..2..3
..0..0..1..2....3..0..3..2....1..0..2..1....3..0..3..0....1..0..3..2
..3..3..2..1....2..0..1..1....3..3..2..0....2..1..2..1....0..3..2..1
..3..3..1..2....0..2..1..1....3..3..0..2....1..2..1..2....3..0..1..2
CROSSREFS
Cf. A268142.
Sequence in context: A165641 A213149 A267727 * A113550 A370738 A221400
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 27 2016
STATUS
approved