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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A185567

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..10

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

Adjacent sequences:  A185557 A185558 A185559 * A185561 A185562 A185563

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 31 2011

STATUS

approved

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Last modified May 26 21:56 EDT 2022. Contains 354092 sequences. (Running on oeis4.)