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A267070 Number of nX2 arrays containing 2 copies of 0..n-1 with no element 1 greater than its west or southwest neighbor modulo n and the upper left element equal to 0. 0

%I

%S 1,0,2,44,1949,119544,9966710,1094087602,153634294614,26915214507240,

%T 5760519575052132,1479878539858828536

%N Number of nX2 arrays containing 2 copies of 0..n-1 with no element 1 greater than its west or southwest neighbor modulo n and the upper left element equal to 0.

%C Column 2 of A267072.

%e Some solutions for n=4

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

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

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

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

%Y Cf. A267072.

%K nonn

%O 1,3

%A _R. H. Hardin_, Jan 10 2016

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Last modified September 23 11:53 EDT 2020. Contains 337310 sequences. (Running on oeis4.)