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A185560
1/4 the number of n X n 0..3 arrays with no element equal both to the element above and to the element to its left
1
1, 60, 50580, 598507920, 99407416968000, 231753101877188629380, 7583858300260627032845531520, 3483475434832751291309593655505225600, 22459143127863154464679826472043109609252549520
OFFSET
1,2
COMMENTS
Diagonal of A185567
LINKS
EXAMPLE
Some solutions for 3X3 with a(1,1)=0
..0..1..2....0..3..2....0..0..0....0..3..2....0..2..1....0..0..0....0..0..3
..3..1..1....1..2..0....1..2..2....0..0..0....1..3..0....0..2..0....3..3..0
..3..3..1....1..2..0....3..3..3....1..1..3....0..1..3....0..0..2....0..0..1
CROSSREFS
Sequence in context: A092870 A221936 A225990 * A003788 A222019 A123378
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 31 2011
STATUS
approved