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%I #5 Dec 18 2015 18:18:28
%S 1,7,72,600,4032,24576,138240,743424,3833856,19267584,94371840,
%T 454557696
%N Number of n X n 0..3 arrays with no element equal to another at a city block distance of exactly two, and new values 0..3 introduced in row major order
%C Diagonal of A222838
%e Some solutions for n=4
%e ..0..1..1..2....0..1..1..0....0..1..2..2....0..1..2..0....0..1..2..3
%e ..3..2..0..0....0..2..3..3....2..3..3..0....0..3..3..0....3..1..2..3
%e ..1..2..3..1....1..2..0..1....2..0..1..1....2..2..1..1....2..0..0..1
%e ..0..0..3..1....1..3..0..1....1..0..2..2....3..0..0..2....2..3..3..2
%K nonn
%O 1,2
%A _R. H. Hardin_ Mar 06 2013
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