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A265459
Number of n X n 0..2n-2 arrays with upper left zero and lower right 2n-2 and each element differing from its horizontal and antidiagonal neighbors by one or two.
0
1, 3, 550, 398508, 2002867877, 49094408347776, 6109458550119472926, 3756191694523776480082260, 11421616015549105186265908485988
OFFSET
1,2
COMMENTS
Diagonal of A265466.
EXAMPLE
Some solutions for n=3
..0..2..4....0..2..1....0..2..3....0..2..3....0..1..2....0..2..0....0..2..3
..3..2..1....3..2..0....3..2..1....0..2..4....2..3..4....0..2..0....3..2..0
..1..3..4....1..2..4....1..3..4....3..2..4....2..3..4....0..2..4....4..2..4
CROSSREFS
Cf. A265466.
Sequence in context: A332153 A158247 A034314 * A201431 A171359 A002306
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 09 2015
STATUS
approved