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A265867 Number of nX2 arrays containing 2 copies of 0..n-1 with no element plus any antidiagonal neighbor equal to n-1. 0

%I #5 Aug 12 2016 07:04:20

%S 1,2,42,984,48216,2869200,278125200,31015797120,4991834736000,

%T 896085889171200,215916261060729600,56895400548095155200

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

%C Column 2 of A265870.

%e Some solutions for n=4

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

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

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

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

%Y Cf. A265870.

%K nonn

%O 1,2

%A _R. H. Hardin_, Dec 17 2015

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Last modified May 26 20:04 EDT 2024. Contains 372844 sequences. (Running on oeis4.)