The OEIS is supported by the many generous donors to the OEIS Foundation.
%I #4 Aug 12 2016 07:05:17
%S 0,0,30,3344,2450392,1627602144,2887429166352,4949478766305024
%N Number of nX3 arrays containing 3 copies of 0..n-1 with no element plus any horizontal or antidiagonal neighbor equal to n-1.
%C Column 3 of A265856.
%e Some solutions for n=4
%e ..3..2..0....0..2..2....0..0..0....0..0..0....2..3..1....1..0..1....2..0..2
%e ..0..1..1....2..3..3....1..1..3....1..1..1....1..0..0....0..1..3....2..0..1
%e ..0..1..3....1..1..3....1..3..2....3..3..2....2..0..2....3..3..2....0..1..3
%e ..3..2..2....0..1..0....2..2..3....2..3..2....1..3..3....2..2..0....1..3..3
%Y Cf. A265856.
%K nonn
%O 1,3
%A _R. H. Hardin_, Dec 16 2015