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%I #4 Aug 12 2016 07:05:15
%S 0,1,56,3201,307016,43200625,8403205056,2162875665601,712215325718576,
%T 292162814336854881,146127700393451369000
%N Number of nX3 arrays containing 3 copies of 0..n-1 with no equal horizontal neighbors and new values introduced sequentially from 0.
%C Column 3 of A264945.
%e Some solutions for n=4
%e ..0..1..2....0..1..2....0..1..2....0..1..2....0..1..2....0..1..2....0..1..2
%e ..3..0..2....3..0..2....3..2..0....3..0..1....0..1..3....3..1..3....1..2..3
%e ..3..1..3....3..1..3....0..1..3....2..3..0....1..2..3....2..3..0....2..1..3
%e ..1..0..2....0..2..1....1..3..2....1..3..2....2..3..0....2..1..0....0..3..0
%Y Cf. A264945.
%K nonn
%O 1,3
%A _R. H. Hardin_, Nov 29 2015