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A265419 Number of nX2 arrays containing 2 copies of 0..n-1 with no equal horizontal, vertical, diagonal or antidiagonal neighbors and new values introduced sequentially from 0. 0

%I

%S 0,0,0,4,48,584,8096,127296,2241856,43770144,939182976,21981580224,

%T 557527020544,15236894019072,446459870047232,13964134704426752,

%U 464407462322500608

%N Number of nX2 arrays containing 2 copies of 0..n-1 with no equal horizontal, vertical, diagonal or antidiagonal neighbors and new values introduced sequentially from 0.

%C Column 2 of A265421.

%e Some solutions for n=6

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

%e ..2..3....2..3....2..3....2..3....2..3....2..3....2..3....2..3....2..3....2..3

%e ..0..1....1..4....0..4....0..4....4..0....0..4....4..5....1..0....1..4....4..0

%e ..4..5....3..5....5..2....1..5....5..3....5..2....1..2....4..5....3..5....2..5

%e ..3..2....0..4....3..1....2..3....1..4....1..4....4..5....2..3....2..4....3..4

%e ..4..5....5..2....4..5....4..5....5..2....5..3....0..3....4..5....0..5....1..5

%Y Cf. A265421.

%K nonn

%O 1,4

%A _R. H. Hardin_, Dec 08 2015

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Last modified July 29 22:13 EDT 2021. Contains 346346 sequences. (Running on oeis4.)