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A267727
Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to at least one horizontal neighbor and the top left element equal to 0.
0
0, 6, 6, 630, 1398, 93672, 609264, 20702760, 279681294, 7420195854, 149049265998, 3763960753368, 88917911372016
OFFSET
1,2
COMMENTS
Row 4 of A267724.
EXAMPLE
Some solutions for n=4
..0..0..0..0....0..0..3..3....0..0..1..1....0..0..2..2....0..0..2..2
..2..2..3..3....1..1..3..3....0..0..3..3....1..1..3..3....3..3..3..3
..2..2..1..1....2..2..0..0....2..2..3..3....0..0..3..3....2..2..0..0
..1..1..3..3....1..1..2..2....2..2..1..1....1..1..2..2....1..1..1..1
CROSSREFS
Cf. A267724.
Sequence in context: A370711 A165641 A213149 * A268144 A113550 A370738
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 20 2016
STATUS
approved