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A198289
Number of 2nX6 0..3 arrays with values 0..3 introduced in row major order and each element equal to exactly one horizontal and vertical neighbor
1
272, 413375, 706120206, 1275102148950, 2366880827870877, 4452440424252727173, 8428943308912271720848, 16004596485813250391893906, 30431540879946488350797932499, 57901155886923326494331172396019
OFFSET
1,1
COMMENTS
Column 3 of A198290
LINKS
EXAMPLE
Some solutions for n=2
..0..0..1..1..2..2....0..0..1..1..0..0....0..0..1..1..2..2....0..0..1..2..2..0
..2..2..3..3..1..1....1..1..0..0..1..2....2..2..0..0..1..1....3..3..1..3..3..0
..1..0..0..2..0..0....3..0..1..3..1..2....0..1..2..2..3..0....0..1..0..2..0..3
..1..3..3..2..3..3....3..0..1..3..0..0....0..1..0..0..3..0....0..1..0..2..0..3
CROSSREFS
Sequence in context: A283789 A331655 A225833 * A198595 A028467 A203758
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 23 2011
STATUS
approved