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A266207 Number of nX2 arrays containing 2 copies of 0..n-1 with no element plus any horizontal, vertical, diagonal or antidiagonal neighbor equal to n-1. 0

%I #5 Aug 12 2016 07:04:21

%S 0,0,0,8,544,20976,3124800,269723136,61919980032,9210279970560,

%T 2897383466019840

%N Number of nX2 arrays containing 2 copies of 0..n-1 with no element plus any horizontal, vertical, diagonal or antidiagonal neighbor equal to n-1.

%C Column 2 of A266208.

%e Some solutions for n=6

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

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

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

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

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

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

%Y Cf. A266208.

%K nonn

%O 1,4

%A _R. H. Hardin_, Dec 23 2015

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Last modified May 24 01:38 EDT 2024. Contains 372768 sequences. (Running on oeis4.)