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A265879 Number of nX2 arrays containing 2 copies of 0..n-1 with no element plus any horizontal neighbor equal to n-1. 0

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

%S 0,2,24,792,39360,2396880,241012800,27159592320,4466274785280,

%T 806760393465600,197138895617664000,52164067053271219200

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

%C Column 2 of A265882.

%e Some solutions for n=4

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

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

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

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

%Y Cf. A265882.

%K nonn

%O 1,2

%A _R. H. Hardin_, Dec 17 2015

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Last modified March 28 17:42 EDT 2024. Contains 371254 sequences. (Running on oeis4.)