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A264952 Number of nX2 arrays containing 2 copies of 0..n-1 with no equal horizontal or vertical neighbors. 0

%I

%S 0,2,12,504,22320,1521360,140394240,17034433920,2627788262400,

%T 502511002156800,116684130094963200,32342603041381248000

%N Number of nX2 arrays containing 2 copies of 0..n-1 with no equal horizontal or vertical neighbors.

%C Column 2 of A264954.

%e Some solutions for n=4

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

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

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

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

%Y Cf. A264954.

%K nonn

%O 1,2

%A _R. H. Hardin_, Nov 29 2015

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Last modified September 26 06:16 EDT 2021. Contains 347664 sequences. (Running on oeis4.)