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Number of n X 3 arrays containing 3 copies of 0..n-1 with no element 1 greater than its north, southwest or northwest neighbor modulo n and the upper left element equal to 0.
0

%I #6 Mar 10 2022 20:41:05

%S 1,0,2,76,33529,22720474,25455579224,44453913778842

%N Number of n X 3 arrays containing 3 copies of 0..n-1 with no element 1 greater than its north, southwest or northwest neighbor modulo n and the upper left element equal to 0.

%C Column 3 of A266878.

%e Some solutions for n=4

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

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

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

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

%Y Cf. A266878.

%K nonn

%O 1,3

%A _R. H. Hardin_, Jan 05 2016