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

%I #5 Aug 12 2016 07:04:22

%S 1,0,0,8,411,30362,2742512,317221226,46165940578,8303305172988,

%T 1813340078934264

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

%C Column 2 of A267163.

%e All solutions for n=4

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

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

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

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

%Y Cf. A267163.

%K nonn

%O 1,4

%A _R. H. Hardin_, Jan 11 2016