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A217267 Number of n X n arrays of occupancy after each element moves to some horizontal or vertical neighbor. 0

%I

%S 0,9,1472,2572816,48909857500,10211121295308649,

%T 23397344246732649325860

%N Number of n X n arrays of occupancy after each element moves to some horizontal or vertical neighbor.

%C Diagonal of A217273

%e Some solutions for n=3

%e ..1..1..2....2..1..1....0..0..1....2..1..1....0..2..1....0..1..2....1..1..0

%e ..1..0..2....2..1..0....3..1..2....1..0..1....1..0..1....1..1..3....1..0..0

%e ..1..1..0....0..2..0....2..0..0....1..2..0....1..1..2....0..0..1....1..3..2

%K nonn,hard,more

%O 1,2

%A _R. H. Hardin_, Sep 29 2012

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Last modified June 18 04:41 EDT 2021. Contains 345098 sequences. (Running on oeis4.)